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Lakhmir Singh solutions for Class 9 Science chapter 1 - Matter in Our Surroundings

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Lakhmir Singh Class 9 Chemistry - Science Part 2

Class 9 Chemistry - Science Part 2 - Shaalaa.com

Chapter 1: Matter in Our Surroundings

Very Short AnswersShort AnswersLong AnswersMultiple Choice QuestionsHots Questions

Chapter 1: Matter in Our Surroundings Exercise Very Short Answers, Short Answers, Long Answers, Multiple Choice Questions, Hots Questions solutions [Pages 17 - 37]

Very Short Answers | Q 1 | Page 17

What are the conditions for 'something' to be called 'matter'?

Very Short Answers | Q 2 | Page 17

Name two processes which provide the best evidence for the motion of particles in matter.

Very Short Answers | Q 3 | Page 17

Which single term is used to describe the mixing of copper sulphate and water kept in a beaker, on its own?

Very Short Answers | Q 4 | Page 17

When sugar is dissolved in water, there is no increase in the volume. Which characteristic of matter is illustrated by this observation?

Very Short Answers | Q 5 | Page 17

Even two or three crystals of potassium permanganate can impart colour to a very large volume of water. Which characteristic of particles of matter is illustrated by this observation?

Very Short Answers | Q 6 | Page 17

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance spreads in the whole room quickly. Which characteristic of the particles of matter is illustrated by this observation?

Very Short Answers | Q 7 | Page 17

A piece of chalk can be broken into small particles by hammering but a piece of iron cannot be taken into small particles by hammering. Which characteristic of the particles of matter is illustrated by these observations?

Very Short Answers | Q 8 | Page 18

What is the scientific name of particles which make up mater?

Very Short Answers | Q 9 | Page 18

Name the process by which a drop of ink spreads in a beaker of water.

Very Short Answers | Q 10 | Page 18

What is the general name of :

  1. rigid form of matter ?
  2. fluid forms of matter ?
Very Short Answers | Q 11 | Page 18

Out of solids, liquids and gases, which one has :

  1. maximum movement of particles ?
  2. maximum interparticle attractions ?
  3. minimum spaces between particles ?
Very Short Answers | Q 12 | Page 18

'A substance has definite volume but no definite shape'. State whether this substance is a solid, a liquid or a gas.

Very Short Answers | Q 13 | Page 18

Name the physical state of matter which can be easily compressed.

Very Short Answers | Q 14 | Page 18

'A substance has a definite shape as well as a definite volume'. Which physical state is represented by this statement?

Very Short Answers | Q 15 | Page 18

A substance has neither a fixed shape nor a fixed volume. State whether it is a solid, a liquid or a gas.

Very Short Answers | Q 16 | Page 18

Name two gases which are supplied in compressed form in homes and hospitals.

Very Short Answers | Q 17 | Page 18

Write the full forms of the following

  1. LPG
  2. CNG
Very Short Answers | Q 18 | Page 18

Which of the two diffuses faster : a liquid or a gas?

Very Short Answers | Q 19 | Page 18

Which of the two diffuses slower : bromine vapour into air or copper sulphate into water ?

Very Short Answers | Q 20 | Page 18

State whether the following statement is true or false :

Red-brown bromine vapour diffuse into air in a gas jar but the colourless air molecules do not diffuse into bromine vapour.

Very Short Answers | Q 21 | Page 18

A bottle of perfume was opened in a room. The smell of its vapours spread in the entire room. Name the property of gases which is responsible for this behaviour of perfume vapours.

Very Short Answers | Q 22 | Page 18

If the fish is being fried in a neighbouring home, we can smell it sitting in our own home. Name the process which brings this smell to us.

Very Short Answers | Q 23 | Page 18

Name one property of liquids and gases which tells us that their molecules are moving constantly.

Very Short Answers | Q 24.1 | Page 18

Fill in the following blank with suitable words :

The best evidence that the particles of matter are constantly moving comes from the studies of ................. and ...................

Very Short Answers | Q 24.2 | Page 18

Fill in the following blank with suitable words :

The smell of perfume gradually spreads across a room due to .....................

Very Short Answers | Q 24.3 | Page 18

Fill in the following blank with suitable words :

Solid, liquid and gas are the three ........................ of matter.

Very Short Answers | Q 24.4 | Page 18

Fill in the following blank with suitable words :

At room temperature, the forces of attraction between the particles of solid substances are ....................... then those which exist in the gaseous state.

Very Short Answers | Q 24.5 | Page 18

Fill in the following blank with suitable words :

The arrangement of particles is less ordered in the ...................... state. However, there is no order in the ..................... state .

Short Answers | Q 25.1 | Page 19

State two characteristics of matter demonstrated by diffusion.

Short Answers | Q 25.2 | Page 19

State two characteristics of matter demonstrated by Brownian motion.

Short Answers | Q 26 | Page 19

Name the scientist who studied the movement of pollen grains suspended in water through a microscope. What is this phenomenon known as?

Short Answers | Q 27 | Page 19

When a crystal of potassium permanganate is placed in a beaker, its purple colour spreads throughout the water. What does this observation tell us about the nature of potassium permanganate and water?

Short Answers | Q 28 | Page 19

When a gas jar containing air is inverted over a gas jar containing bromine vapour, the red-brown bromine vapour diffuse into air. Explain how bromine vapour diffuse into air.

Short Answers | Q 29 | Page 19

Describe in your own words, what happens to the particles when salt dissolves in water.

Short Answers | Q 30 | Page 19

Explain why, we can easily move our hand in air but to do the same through a plank of wood, we need a karate expert.

Short Answers | Q 31 | Page 19

Give one example of the diffusion of a solid in another solid.

Short Answers | Q 32 | Page 19

Explain why, the diffusion of a solid in another solid is a very slow process.

Short Answers | Q 33 | Page 19

Which of the following diffuses fastest and which the slowest?
Solid, Liquid, Gas Give reasons for your answer.

Short Answers | Q 34 | Page 19

Explain the following :

When an incense stick is lighted in the corner of a room, its fragrance spreads quickly in the entire room.

Short Answers | Q 35 | Page 19

Name the three states of matter. Give one example of each.

Short Answers | Q 36.1 | Page 19

State two characteristic properties of a solid.

Short Answers | Q 36.2 | Page 19

State two characteristic properties of a liquid.

Short Answers | Q 36.3 | Page 19

State two characteristic properties of a gas.

Short Answers | Q 37 | Page 19

Why do gases have neither a fixed shape nor a fixed volume?

Short Answers | Q 38 | Page 19

How do solids, liquids and gases differ in shape and volume?

Short Answers | Q 39 | Page 19

Arrange the following substances in increasing order of force of attraction between their particles (keeping the substance having the minimum force of attraction first) : Water, Sugar, Oxygen

Short Answers | Q 40.1 | Page 19

Give two reasons to justify that Water is a liquid at room temperature.

Short Answers | Q 40.2 | Page 19

Give two reasons to justify that An iron almirah is a  solid.

Short Answers | Q 41.1 | Page 19

When an incense stick (agarbatti) is lighted in one corner of a room, its fragrance quickly spreads in the entire room. Name the process involved in this.

Short Answers | Q 41.2 | Page 19

A girl is cooking some food in the kitchen. The smell of food being cooked soon reaches her brother's room. Explain how the smell could have reached her brother's room.

Short Answers | Q 42.1 | Page 19

What does the diffusion of gases tell us about their particles?

Short Answers | Q 42.2 | Page 37

Define the following terms Condensation

Short Answers | Q 42.2 | Page 19

Give one example of diffusion of gases in a liquid.

Short Answers | Q 43 | Page 19

Give reason for the following observation :

The smell of hot sizzling food reaches us even from a considerable distance but to get the smell from cold food, we have to go close to it.

Short Answers | Q 44 | Page 19

Explain how, the smell of food being cooked in the kitchen reaches us even from a considerable distance.

Short Answers | Q 45 | Page 19

Explain why, when a bottle of perfume is opened in a room, we can smell it even from a considerable distance.

Short Answers | Q 46 | Page 19

When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. Why?

Short Answers | Q 47 | Page 19

Honey is more viscous than water. Can you suggest why?

Short Answers | Q 48.1 | Page 19

Explain why air is used to inflate tyres.

Short Answers | Q 48.2 | Page 19

Explain why steel is used to make railway lines.

Short Answers | Q 49 | Page 19

Explain why, diffusion occurs more quickly in a gas than in a liquid.

Long Answers | Q 50.1 | Page 20

What is meant by 'diffusion'? Give one example of diffusion in gases.

Long Answers | Q 50.2 | Page 20

Why do gases diffuse very fast?

Long Answers | Q 50.3 | Page 20

Name two gases of air which dissolve in water by diffusion. What is the importance of this process in nature?

Long Answers | Q 51.1 | Page 20

Compare the properties of solids, liquids and gases in tabular form.

Long Answers | Q 51.2 | Page 20

Give two reasons for saying that wood is a solid.

Long Answers | Q 52.1 | Page 20

Why does a gas exert pressure?

Long Answers | Q 52.3 | Page 20

Why does a gas fill a vessel completely?

Long Answers | Q 52.3 | Page 20

Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid?

Long Answers | Q 53.1 | Page 20

Define matter. Give four examples of matter.

Long Answers | Q 53.2 | Page 20

What are the characteristics of matter?

Long Answers | Q 54.1 | Page 20

What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain during Brownian motion.

Long Answers | Q 54.2 | Page 20

In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?

Multiple Choice Questions | Q 55 | Page 20

When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of :

  • distribution

  • intrusion

  • diffusion

  • effusion

Multiple Choice Questions | Q 56 | Page 20

Which one of the following statement is correct in respect of fluids?

  • only gases behave as fluids

  • gases and solids behave as fluids

  • gases and liquids behave as fluids

  • only liquids are fluids

Multiple Choice Questions | Q 57 | Page 20

A few substances are arranged in the increasing order of 'forces of attraction' between their particles. Which one of the following represents the correct arrangement?

  • water, air, wind

  • air, sugar, oil

  • oxygen, water, sugar

  • salt, juice, air

Multiple Choice Questions | Q 58 | Page 20

In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

  1. increasing pressure on hydrogen contained in a closed container
  2. some hydrogen gas leaking out of the container
  3. increasing the volume of the container of hydrogen gas
  4. adding more hydrogen gas to the container without increasing the volume of the container
  • (i) and (iii)

  • (i) and (iv)

  • (ii) and (iii)

  • (ii) and (iv)

Multiple Choice Questions | Q 59 | Page 21

Out of the following, an example of matter which can be termed as fluid is :

  • carbon

  • sulphur

  • oxygen

  • phosphorus

Multiple Choice Questions | Q 60 | Page 21

The best evidence for the existence and movement of particles in liquids was provided by :

  • John Dalton

  • Ernest Rutherford

  • J.J. Thomson

  • Robert Brown

Multiple Choice Questions | Q 61 | Page 21

A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is :

  • krypton

  • kerosene

  • carbon steel

  • carbon dioxide

Multiple Choice Questions | Q 62 | Page 21

Which of the following statement is incorrect?

  • the particles of matter are very, very small

  • the particles of matter attract one another

  • the particles of some of the matter are moving constantly

  • the particles of all the matter have spaces between them

Multiple Choice Questions | Q 63 | Page 21

When a gas jar full of air is placed upside down on a gas jar full of bromine  vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment :

  • air is heavier than bromine

  • both air and bromine have the same density

  • bromine is heavier than air

  • bromine cannot be heavier than air because it is going upwards against gravity

Multiple Choice Questions | Q 64 | Page 21

When a gas jar containing colourless air is kept upside  down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect?

  • bromine vapour is made of tiny particles which are moving

  • air is made up of tiny particles which are moving

  • the particles of bromine are moving but those of air are not moving

  • even though bromine vapour is heavier that air, it can move up against gravity

Multiple Choice Questions | Q 65 | Page 21

Which one of the following statements is not true?

  1. the molecules in a solid vibrate about a fixed position
  2. the molecules in a liquid are arranged in a regular pattern
  3. the molecules in a gas exert negligibly small forces on each other, except during collisions
  4. the molecules of a gas occupy all the space available
Multiple Choice Questions | Q 66 | Page 21

Look at the diagram on the right side. Jar A contains a red-brown gas whereas jar B contains a colourless gas. The two gas jars are separated by a galas plate placed between them

  1. What will happen when the glass plate between the two jars is pulled away?
  2. What name is given to the phenomenon which takes place?
  3. Name the brown gas which could be in jar A.
  4. Which is the colourless gas most likely to be present in jar B?
  5. Name one coloured solid and one colourless liquid which can show the same phenomenon.

Multiple Choice Questions | Q 67 | Page 21

Bromine and air take about 15 minutes to diffuse completely but bromine diffuses into a vacuum very rapidly. Why is this so?

Multiple Choice Questions | Q 68 | Page 21

Bromine particles are almost twice as heavy as chlorine particles. Which gas will diffuse faster; bromine (vapour) or chlorine? Explain your answer.

Multiple Choice Questions | Q 69 | Page 21

Why is liquid (the hydraulic fluid) used to operate the brakes in a car?

Multiple Choice Questions | Q 70 | Page 21

Explain why, a small volume of water in a kettle can fill a kitchen with steam.

Multiple Choice Questions | Q 71 | Page 21

Explain why, osmosis can be considered to be a special kind of diffusion. Classify the following into

(i) osmosis, and (ii) diffusion  :

  1. swelling up of a raisin on keeping in water
  2. spreading of virus on sneezing
  3. earthworm dying on coming in contact with common salt
  4. shrinking of grapes kept in thick sugar syrup
  5. preserving of pickles in salt
  6. spreading of smell of cake being baked in the kitchen
  7. aquatic animals using oxygen dissolved in water during respiration
Hots Questions | Q 72 | Page 22

A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red-brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.

Hots Questions | Q 73 | Page 22

An inflated balloon full of air goes down slowly (becomes smaller and smaller slowly) even though the knot at the mouth of the balloon is airtight. And after a week all the air has escaped from the balloon. Explain how the air particles got out of the balloon.

Hots Questions | Q 74 | Page 22

When extremely small particles X derived from the anther of a flower were suspended in a liquid Y and observed through a microscope, it was found that the particles X were moving throughout the liquid Y in a very zig-zag way. It was also observed that warmer the liquid Y, faster the particles X moved on its surface.

  1. What could particles X be ?
  2. What do you think liquid Y is ?
  3. What is the zig-zag movement of X known as ?
  4. What is causing the zig-zag movement of particles X ?
  5. Name the scientist who discovered this phenomenon.
  6. What does this experiment tell us about the nature of liquid Y?
Hots Questions | Q 75 | Page 22

When a beam of sunlight enters a room through a window, we can see tiny particles X suspended in a gas (or rather a mixture of gases) Y which are moving rapidly in a very haphazard manner.

  1. What could particles X be ?
  2. Name the gas (or mixture of gases) Y.
  3. What is the phenomenon exhibited by particles X known as ?
  4. What is causing the movement of particles X ?
  5. What conclusion does the existence of this phenomenon give us about the nature of matter ?

Chapter 1: Matter in Our Surroundings Exercise Very Short Answers, Short Answers, Long Answers, Multiple Choice Questions, Hots Questions solutions [Pages 36 - 56]

Very Short Answers | Q 1 | Page 36

The boiling point of water is 100° C. Express this in SI units (Kelvin scale).

Very Short Answers | Q 2 | Page 36

The Kelvin temperature is 270 K. What is the corresponding Celsius scale temperature ?

Very Short Answers | Q 3 | Page 36

Convert the temperature of 573 K to the Celsius scale.

Very Short Answers | Q 4 | Page 36

Convert the temperature of 373° C to the Kelvin scale.

Very Short Answers | Q 5 | Page 36

The boiling point of alcohol is 78° C. What is this temperature on Kelvin scale ?

Very Short Answers | Q 6 | Page 36

The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale temperature ?

Very Short Answers | Q 6 | Page 56

Name a non-metal which is a good conductor of electricity.

Very Short Answers | Q 7 | Page 36

Give the usual name for the following :

Heat required to change the state of a substance without changing the temperature.

Very Short Answers | Q 8 | Page 36

What is the (a) common unit of temperature, and (b) SI unit of temperature ?

Very Short Answers | Q 9 | Page 36

Write the relation between Kelvin scale and Celsius scale of temperature.

Very Short Answers | Q 10 | Page 36

What should be added to a Celsius scale reading so as to obtain the corresponding Kelvin scale reading ?

Very Short Answers | Q 11 | Page 36

What is meant by saying that the latent heat of fusion of ice is 3.34 × 105 J/kg ?

Very Short Answers | Q 12 | Page 36

What is meant by saying that the latent heat of vaporisation of water is 22.5  × 105 J/kg ?

Very Short Answers | Q 13 | Page 36

Name the temperature at which :

  1. a liquid changes into a gas. 
  2. a solid changes into a liquid.
Very Short Answers | Q 14 | Page 36

Name one common substance which can be easily changed from one state to another by heating or cooling.

Very Short Answers | Q 15.1 | Page 36

What is the name of the process in which a solid turns directly into a gas ?

Very Short Answers | Q 15.2 | Page 36

What is the name of the process in which a gas turns directly into a solid ?

Very Short Answers | Q 16 | Page 36

Name one property which is shown by ammonium chloride but not by sodium chloride.

Very Short Answers | Q 17 | Page 36

What is the name of the process due to which dry ice changes into carbon dioxide gas ?

Very Short Answers | Q 18 | Page 36

What is the common name of solid carbon dioxide ?

Very Short Answers | Q 19 | Page 36

Why is solid carbon dioxide known as dry ice ?

Very Short Answers | Q 20 | Page 36

State one condition necessary to liquefy gases (other than applying high pressure).

Very Short Answers | Q 21 | Page 36

State whether the following statement is true or false :
Solid carbon dioxide is stored under low pressure.

Very Short Answers | Q 22 | Page 36

What is the chemical name of dry ice ?

Very Short Answers | Q 23.1 | Page 36

Fill in the following blank with suitable words :

Gases can be liquefied by applying ....................... and lowering .....................

Very Short Answers | Q 23.2 | Page 36

Fill in the following blank with suitable words :

When steam condenses to form water, heat is .......................

Very Short Answers | Q 23.3 | Page 36

Fill in the following blank with suitable words :

Temp on Kelvin scale = Temp on Celsius scale + ........................

Very Short Answers | Q 23.4 | Page 36

Fill in the following blank with suitable words :

Scientists say that there are actually five states of matter : solid, liquid, gas,  .................... and ...................

Very Short Answers | Q 23.5 | Page 36

Fill in the following blank with suitable words :

The state of matter  called ........................ makes a fluorescent tube (or neon sign bulb) to glow.

Short Answers | Q 24 | Page 36

What do you understand by the term 'latent heat' ? What are the two types of latent heat ?

Short Answers | Q 25 | Page 36

Why is heat energy needed to melt a solid ? What is this heat energy called ?

Short Answers | Q 26 | Page 36

Under what conditions heat can be given to a substance without raising its temperature ?

Short Answers | Q 27 | Page 36

Why does the temperature remain constant during the melting of ice even though heat is supplied continuously ?

Short Answers | Q 28 | Page 36

Why does the temperature remain constant during the boiling of water even though heat is supplied continuously ?

Short Answers | Q 29 | Page 36

Explain why, ice at 0° C is more effective in cooling than water at the same temperature.

Short Answers | Q 30 | Page 36

Would you cool a bucket of water more quickly by placing it on ice or by placing ice in it ? Give reasons for your answer.

Short Answers | Q 31 | Page 36

Why does steam cause more severe burns than boiling water ?

Short Answers | Q 32 | Page 36

Which contains more heat, 1 kg of ice of 0° C or 1 kg of water at 0° C ? Give reason for your answer.

Short Answers | Q 33 | Page 37

Which contains more heat, 1 kg of water at 100° C or 1 kg of steam at 100° C ? Give reason for your answer.

Short Answers | Q 34 | Page 37

Explain why, steam at 100° C is better for heating purposes than boiling water at 100° C.

Short Answers | Q 35 | Page 37

Which produces more severe burns : boiling water or steam ? Why ?

Short Answers | Q 36 | Page 37

Why does the temperature of a substance remain constant during the change of state ?

Short Answers | Q 37.1 | Page 37

What is the physical state of water at 0°C.

Short Answers | Q 37.2 | Page 37

What is the physical state of water at 25°C.

Short Answers | Q 37.3 | Page 37

What is the physical state of water at 100°C.

Short Answers | Q 37.4 | Page 37

What is the physical state of water at 250°C.

Short Answers | Q 38 | Page 37

Explain why, there is no rise in temperature of a substance when it undergoes a change of state though heat is supplied continuously.

Short Answers | Q 39 | Page 37

Define 'melting point' of a substance ? What is the melting point of ice

Short Answers | Q 40 | Page 37

Define 'boiling point' of a substance ? What is the boiling point of water ?

Short Answers | Q 41.1 | Page 37

Define the following term Melting.

Short Answers | Q 41.2 | Page 37

Define the following term Boiling.

Short Answers | Q 42.2 | Page 37

Define the following term Freezing.

Short Answers | Q 43 | Page 37

Explain why, naphthalene balls kept in stored clothes in our homes disappear over a period of time.

Short Answers | Q 44 | Page 37

Explain briefly, how gases can be liquefied.

Short Answers | Q 45 | Page 37

How is ammonia gas liquefied ?

Short Answers | Q 46 | Page 37

How does applying pressure (or compression) help in the liquefaction of a gas ?

Short Answers | Q 47 | Page 37

How does perspiration or sweating help keep our body cool on a hot day ?

Short Answers | Q 48 | Page 37

Why does all the water of the earth not get evaporated during hot summer days ?

Short Answers | Q 49 | Page 37

If the back of your hand is moistened with alcohol, you will find that it rapidly becomes dry. Why is it that while it is drying, your hand feels cool ?

Short Answers | Q 50 | Page 37

Why does a desert cooler cool better on a hot, dry day ?

Short Answers | Q 51 | Page 37

How does the water kept in an earthen pot (matka) become cold during summer ?

Short Answers | Q 52 | Page 37

What type of clothes should we wear in summer ? Why ?

Short Answers | Q 53 | Page 37

Why are we able to sip hot tea or milk faster from a saucer rather than from a cup ?

Short Answers | Q 54 | Page 37

Why does our palm feel cold when we put some acetone (or perfume) on it ?

Short Answers | Q 55 | Page 37

How will you demonstrate that water vapour is present in air ?

Long Answers | Q 56.1 | Page 37

Define the term 'latent heat of fusion' of a solid. How much is the latent heat of fusion of ice ?

Long Answers | Q 56.2 | Page 37

Draw a labelled diagram of the experimental set-up to study the latent heat of fusion of ice.

Long Answers | Q 57.1 | Page 37

Define the term 'latent heat of vaporisation' of a liquid. What is the value of the latent heat of vaporisation of water ?

Long Answers | Q 57.2 | Page 37

Draw a labelled diagram of the experimental set-up to study the latent heat of vaporisation of water.

Long Answers | Q 58.1 | Page 37

What is sublimation ? Name two substances (other than ammonium chloride) which undergo sublimation.

Long Answers | Q 58.2 | Page 37

Draw a labelled diagram of the experimental set-up to demonstrate the sublimation of ammonium chloride.

Long Answers | Q 59.1 | Page 37

What are the two ways in which the physical states of matter can be changed ?

Long Answers | Q 59.2 | Page 37

Draw the 'states of matter triangle' to show the interconversion of states of matter.

Long Answers | Q 59.3 | Page 37

How can the evaporation of a liquid be made faster ?

Long Answers | Q 60.1 | Page 37

What is evaporation ? State the various  factors which affect evaporation.

Long Answers | Q 60.2 | Page 37

Why does evaporation cool a liquid ?

Multiple Choice Questions | Q 61 | Page 38

Which of the following are also considered to be the states of matter ?

  1. Plasma
  2. Platelets
  3. BEC
  4. BHC
  • (i) and (ii)

  • (ii) and (iii)

  • (ii) and (iii)

  • (ii) and (iv)

Multiple Choice Questions | Q 62 | Page 38

One of the following does not undergo sublimation. This one is :

  • iodine

  • sodium chloride

  • ammonium chloride

  • camphor

Multiple Choice Questions | Q 63 | Page 38

Which of the following process/processes release heat ?

  1. condensation
  2. vaporisation
  3. freezing
  4. melting
  • only (i)

  • only (iv)

  • (i) and (iii)

  • (ii) and (iv)

Multiple Choice Questions | Q 64 | Page 38

If the temperature of an object is 268 K, it will be equivalent to :

  • – 5°C

  • + 5°C

  • 368°C

  • – 25°C

Multiple Choice Questions | Q 65 | Page 38

The boiling point of ethane is – 88°C. This temperature will be equivalent to :

  • 285 K

  • 288 K

  • 185 K

  • 361 K

Multiple Choice Questions | Q 66 | Page 38

When heat is constantly supplied by a gas burner with small flame to melt ice, then the temperature of ice during melting :

  • increases very slowly

  • does not increase at all

  • first remains constant and then increases

  • increases to form liquid water

Multiple Choice Questions | Q 67 | Page 38

When water at 0°C freezes to form ice at the same temperature of 0°C, then it :

  • absorbs some heat

  • releases some heat

  • neither absorbs nor releases heat

  • absorbs exactly 3.34 × 105 J/kg of heat

Multiple Choice Questions | Q 68 | Page 38

When heat is constantly supplied by a burner to boiling water, then the temperature of water  during vaporisation :

  • rises very slowly

  • rises rapidly until steam is produced

  • first rises and then becomes constant

  • does not rise at all

Multiple Choice Questions | Q 69 | Page 38

The latent heat of fusion of ice is :

  • 33.4 × 105 J/kg

  • 22.5 × 105 J/kg

  • 33.4 × 104 J/kg

  • 22.5 × 104 J/kg

Multiple Choice Questions | Q 70 | Page 38

The latent heat of vaporisation of water is :

  • 2.25 × 106 J/kg

  • 3.34 × 106 J/kg

  • 22.5 × 104 J/kg

  • 33.4 × 105 J/kg

Multiple Choice Questions | Q 71 | Page 38

Which one of the following set of phenomena would increase on raising the temperature ?

  • diffusion, evaporation, compression of gases

  • evaporation, compression of gases, solubility

  • evaporation, diffusion, expansion of gases

  • evaporation, solubility, diffusion, compression of gases

Multiple Choice Questions | Q 72 | Page 38

Which of the following represent the suitable conditions for the liquefaction of gases ?

  • low temperature, low pressure

  • high temperature, low pressure

  • low temperature, high pressure

  • high temperature, high pressure

Multiple Choice Questions | Q 73 | Page 38

During summer days, water kept in an earthen pot (pitcher) becomes cool because of the phenomenon of :

  • diffusion

  • transpiration

  • osmosis

  • evaporation

Multiple Choice Questions | Q 74 | Page 38

On converting 25°C, 38°C and 66°C to Kelvin scale, the correct sequence of temperatures will be :

  • 298 K, 311 K and 339 K

  • 298 K, 300 K and 338 K

  • 273 K, 278 K and 543 K

  • 298 K, 310 K and 338 K

Multiple Choice Questions | Q 75 | Page 38

The conversion of a solid into vapours without passing through the liquid state is called :

  • vaporisation

  • fusion

  • sublimation

  • freezing

Multiple Choice Questions | Q 76 | Page 38

The evaporation of water increases under the following conditions :

  • increase in temperature, decrease in surface area

  •  increase in surface area, decrease in temperature

  • increase in surface area, rise in temperature

  • increase in temperature, increase in surface area, addition of common salt

Multiple Choice Questions | Q 77 | Page 39

On converting 308 K, 329 K and 391 K to Celsius scale, the correct sequence of temperatures will be :

  • 33°C, 56°C and 118°C

  • 35°C, 56°C and 119°C

  • 35°C, 56°C and 118°C

  • 56°, 119°C and 35° C

Multiple Choice Questions | Q 78 | Page 39

Which of the following energy is absorbed during the change of state of a substance ?

  • specific heat

  • latent heat

  • heat capacity

  • heat of solution

Multiple Choice Questions | Q 79 | Page 39

Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air ?

  1. increase in pressure
  2. ncrease in temperature
  3. decrease in pressure
  4. decrease in temperature
  • (i) and (ii)

  • (i) and (iii)

  • (ii) and (iii)

  • (ii) and (iv)

Multiple Choice Questions | Q 80 | Page 39

During respiration, glucose and oxygen enter our body cells and waste products carbon dioxide and water leave the body cells by the process of :

  • effusion

  • osmosis

  • diffusion

  • plasmolysis

Hots Questions | Q 81 | Page 39

There are four substances W, X, Y and Z. The substance W is a dark violet solid having diatomic molecules. A solution of W in alcohol is used as a common antiseptic C. The substance X is a white solid which is usually recovered from sea water on a large scale. The substance Y is a white solid which is insoluble in water and used in the form of small balls for the safe storage of woollen clothes. The substance Z is a yet another white solid which is used in making commonly used dry cells.

  1. Name (i) W (ii) X (iii) Y and (iv) Z.
  2. Out of W, X, Y and Z, which substance/substances can undergo sublimation ?
  3. Which substance is organic in nature ?
  4. What is the name of substance C ?
  5. Which substance belongs to the halogen family ?
Hots Questions | Q 82 | Page 39

The substance X normally exists in a physical state which can flow easily but does not fill its vessel completely. It also turns anhydrous copper sulphate blue. When substance X is cooled excessively, it changes into a substance Y which has a fixed shape as well as a fixed volume. If, however, the substance X is heated strongly, it changes into a substance Z which has neither a fixed shape nor a fixed volume.

  1. Name the substances (i) X (ii) Y and (iii) Z.
  2.  What is the process of conversion of X into Y known as ?
  3. At which temperature X gets converted into Y ?
  4. What is the process of conversion of X into Z known as ?
  5. At which temperature X gets converted into Z ?
Hots Questions | Q 83 | Page 39

The scientists now say that there are actually five states of matter A, B, C, D and E. The state A has a fixed volume but no fixed shape. The state B can be compressed very easily by applying pressure and state C has a fixed shape as well as a fixed volume. The state D is a mixture of free electrons and ions whereas state E is named after an Indian scientist and a famous physicist.

  1. Name the physical states (i) A (ii) B (iii) C (iv) D, and (v) E
  2. Name one substance belonging to state C which can directly change into vapours on heating. What is this process known as ?
  3. Name one substance which normally belongs to state B but whose solid form changes directly into gaseous state.
  4. Name the most common substance belonging to state A.
  5. Which state of matter makes the sun and other stars to glow ?
Hots Questions | Q 84 | Page 39

When water is cooled to a temperature x, it gets converted into ice at temperature x by a process called P. And when ice at temperature x is warmed, it gets reconverted into water at the same temperature x in a process called Q.

  1. What is the value of temperature x in Kelvin ?
  2. What is the process P known as ?
  3. What is the name of energy released during process P ?
  4. What is the process Q known as ?
  5. What is the name of energy absorbed during process Q ?
Hots Questions | Q 85 | Page 40

When water is heated to a temperature x, it gets converted into steam at temperature x by a process called R. And when steam at temperature x is cooled, it gets reconverted into water at the same temperature x by a process called S.

  1. How much is the value of x in Kelvin ?
  2. What is the process R called ?
  3. What is the name of the energy absorbed during the process R ?
  4. What is process S known as ?
  5. What is the name of energy released during the process S known as ?\\

Chapter 1: Matter in Our Surroundings

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Lakhmir Singh Class 9 Chemistry - Science Part 2

Class 9 Chemistry - Science Part 2 - Shaalaa.com

Lakhmir Singh solutions for Class 9 Science chapter 1 - Matter in Our Surroundings

Lakhmir Singh solutions for Class 9 Science chapter 1 (Matter in Our Surroundings) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the CBSE Class 9 Chemistry - Science Part 2 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Class 9 Science chapter 1 Matter in Our Surroundings are How Does Evaporation Cause Cooling, Factors Affecting Evaporation, Effect of Change of Pressure, Effect of Change of Temperature, The Gaseous State, The Liquid State, The Solid State, Characteristics of Particles of Matter, Physical Nature of Matter, Matter in Our Surroundings Introduction.

Using Lakhmir Singh Class 9 solutions Matter in Our Surroundings exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Lakhmir Singh Solutions are important questions that can be asked in the final exam. Maximum students of CBSE Class 9 prefer Lakhmir Singh Textbook Solutions to score more in exam.

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