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Selina solutions for Class 6 Selina Concise Chemistry chapter 7 - Water [Latest edition]

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Class 6 Selina Concise Chemistry - Shaalaa.com

Chapter 7: Water

Exercise 1Exercise 2Exercise 3Exercise 4Objective Type QuestionsMultiple Choice QuestionsAdditional Questions for Practice
Exercise 1 [Page 9]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Exercise 1 [Page 9]

Exercise 1 | Q 1.1

Name:
Three major sources of natural water

Exercise 1 | Q 1.2

Name:
 Four sources of surface water

Exercise 1 | Q 1.3

Name:
Two underground sources of water. 

Exercise 1 | Q 2.1

Answer the following questions in short: 
In which form is water present in the atmosphere? 

Exercise 1 | Q 2.2

Answer the following questions in short: 
Which source of water contains the highest concentration of salt in it? 

Exercise 1 | Q 2.3

Answer the following questions in short: 
Why is rainwater considered the purest form of natural water? 

Exercise 1 | Q 2.4

Answer the following questions in short: 
What possible impurities does rainwater contain? 

Exercise 1 | Q 2.5

Answer the following questions in short: 
 What is water table? 

Exercise 1 | Q 2.6

Answer the following questions in short: 
Why is spring water pure enough for drinking but unsuitable for laboratory use? 

Exercise 1 | Q 2.6

Answer the following questions in short: 
Why the taste of spring water differs at different places? 

Exercise 1 | Q 3

List three major impurities present in river water. 

Exercise 1 | Q 4.1

Give the percentage of water in the following:
Rice and wheat grains

Exercise 1 | Q 4.2

Give the percentage of water in the following:
Eggs

Exercise 1 | Q 4.3

Give the percentage of water in the following:
Tomatoes 

Exercise 1 | Q 4.4

Give the percentage of water in the following:
Bread

Exercise 1 | Q 4.5

Give the percentage of water in the following:
Watermelon

Exercise 1 | Q 5.1

What are the three states of water? 

Exercise 1 | Q 6

Why are ice, liquid water, and steam considered to have the same chemical substance?

Exercise 1 | Q 7

How is a cloud formed? 

Exercise 1 | Q 8

What is water cycle? What is its importance? 

Exercise 1 | Q 9.1

How Fog is formed?

Exercise 1 | Q 9.2

How mist is formed?

Exercise 1 | Q 9.3

How Dew is formed?

Exercise 1 | Q 9.4 | Page 9

How frost is formed?

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Exercise 2 [Page undefined]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Exercise 2 [Page undefined]

Exercise 2 | Q 1.1

Name :
Two chemicals used to destroy germs present in water.

Exercise 2 | Q 1.2

Name :
 Two diseases which spread through impure water. 

Exercise 2 | Q 1.3

Name :
A chemical used for loading. 

Exercise 2 | Q 1.4

Name :
Two substances which add taste to water.

Exercise 2 | Q 1.5

Name :
Two household methods to get safe drinking water. 

Exercise 2 | Q 2.1

Answer in brief: 
 Why is river water unfit for drinking?

Exercise 2 | Q 2.2

Answer in brief: 
Why is tap water a mixture?

Exercise 2 | Q 2.3

Answer in brief: 
What is mineral water?

Exercise 2 | Q 2.4

Answer in brief: 
What is the purpose of adding bleaching powder to water supplied to the town? 

Exercise 2 | Q 2.5

Answer in brief: 
How is chemically pure water obtained in the laboratory?

Exercise 2 | Q 2.6

Answer in brief: 
How is water in the swimming pool kept free a germ? 

Exercise 2 | Q 3.1

Define:
Sterilisation

Exercise 2 | Q 3.2

Define:
Sedimentation

Exercise 2 | Q 3.3

Define:
Loading

Exercise 2 | Q 3.4

Define:
Aeration

Exercise 2 | Q 4

What is potable water? List four characteristics of potable water.

Exercise 2 | Q 5

Why is water important for plants and animals?

Exercise 2 | Q 6

What are the three methods of removing germs from natural water? Explain.

Exercise 2 | Q 7

Name the steps involved in the purification of drinking water supplied in cities and towns

Exercise 2 | Q 8

What is the taste of distilled water? Why is it not potable? 

Exercise 2 | Q 9.1

Give reasons
Ice floats on water

Exercise 2 | Q 9.2

Give reasons
Marine life is able to survive in colder regions.

Exercise 2 | Q 9.3

Give reasons
Water droplets can be seen outside a chilled water bottle

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Exercise 3 [Page undefined]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Exercise 3 [Page undefined]

Exercise 3 | Q 1

Why is water called a universal solvent?

Exercise 3 | Q 2.1

Define:
Solute

Exercise 3 | Q 2.2

Define:
Solvent

Exercise 3 | Q 2.3

Define:
Solution

Exercise 3 | Q 2.4

Define:
Saturated solutions

Exercise 3 | Q 2.5

Define:
Unsaturated solutions

Exercise 3 | Q 3

State two factors by which solubility of a solute in a solvent can be increased.

Exercise 3 | Q 4

Why do aquatic animals die in boiled water? 

Exercise 3 | Q 5

State three differences between water and air.

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Exercise 4 [Page undefined]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Exercise 4 [Page undefined]

Exercise 4 | Q 1

State four ways by which water can be conserved.

Exercise 4 | Q 2

Explain the harvesting of water.

Exercise 4 | Q 3

What are the three main causes of water pollution?

Exercise 4 | Q 4

State the main steps to be taken to prevent water pollution. 

Exercise 4 | Q 5

What are the causes of floods and drought?

Exercise 4 | Q 6

State some of the ways in which you as an individual can conserve water.

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Objective Type Questions [Page undefined]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Objective Type Questions [Page undefined]

Objective Type Questions | Q 1.01

Fill in the blank.
Water is a ______ solvent

Objective Type Questions | Q 1.02

Fill in the blank.
_________  is the purest form of natural water.

Objective Type Questions | Q 1.03

Fill in the blank.
Sand and dust are suspended _______  in water

Objective Type Questions | Q 1.04

Fill in the blank.
Seawater has a high concentration of _______.

Objective Type Questions | Q 1.05

Fill in the blank.
Water covers nearly ________ of the surface of the earth

Objective Type Questions | Q 1.06

Fill in the blank.
Evaporation of rainwater leaves _____residue.

Objective Type Questions | Q 1.07

Fill in the blank.
__________  is the chemical added to water to remove the tiny suspended particles.

Objective Type Questions | Q 1.08

Fill in the blank.
A _______ is a uniform mixture of a solute and a solvent.

Objective Type Questions | Q 1.09

Fill in the blank.
Ice, water, and steam have different physical states but are chemically __________.

Objective Type Questions | Q 1.1

Fill in the blank.
Boiling kills most of the ______ in the water.

Objective Type Questions | Q 1.11

Fill in the blanks.
The elements present in the molecules of water are ______ and _____.

Objective Type Questions | Q 2.1

Write True or False for the following statement.
Water is an element

  • True

  • False

Objective Type Questions | Q 2.2

Write True or False for the following statement.
Tap water does not contain dissolved impurities.

  • True

  • False

Objective Type Questions | Q 2.3

Write True or False for the following statement.
Alum is commonly used for removing suspended impurities

  • True

  • False

Objective Type Questions | Q 2.4

Write True or False for the following statement.
Distillation is a good method for purifying water for town supply

  • True

  • False

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Multiple Choice Questions [Page undefined]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Multiple Choice Questions [Page undefined]

Multiple Choice Questions | Q 1.1

Tick (√) the correct alternative from the choice given for the following statement:
Water content in the human body is

  • 70%

  • 75%

  • 80%

  • 90%

Multiple Choice Questions | Q 1.2

Tick (√) the correct alternative from the choice given for the following statement:
The purest form of natural water is

  • seawater

  • river water

  • rainwater

  • lake water

Multiple Choice Questions | Q 1.3

Tick (√) the correct alternative from the choice given for the following statement:
When the water vapour changes into tiny droplets of water near the ground, it is called

  • mist

  • dew

  • fog

  • frost

Multiple Choice Questions | Q 1.4

Tick (√) the correct alternative from the choice given for the following statement:
Water is a

  • compound

  • element

  • mixture

  • none of the above

Multiple Choice Questions | Q 1.5

Tick (√) the correct alternative from the choice given for the following statement:
Common salt is obtained from sea water by

  • distillation

  • crystallisation

  • evaporation

  • sublimation

Multiple Choice Questions | Q 1.6

Tick (√) the correct alternative from the choice given for the following statement:
Jaundice affects

  • heart

  • lungs

  • liver

  • kidney

Multiple Choice Questions | Q 1.7

Tick (√) the correct alternative from the choice given for the following statement:
Chlorination of water is done

  • to kill the germs

  • to remove the suspended impurities

  • to remove the dissolved impurities

  • none of the above

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Additional Questions for Practice [Page undefined]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Additional Questions for Practice [Page undefined]

Additional Questions for Practice | Q 1.1

State the sources of water :
on the earth’s surface

Additional Questions for Practice | Q 1.2

State the sources of water :
below the earth’s surface

Additional Questions for Practice | Q 2.1

Give the importance of water in life processes

Additional Questions for Practice | Q 2.2

Give the importance of water in household purpose

Additional Questions for Practice | Q 2.3

Give the importance of water in Fire fighting

Additional Questions for Practice | Q 2.4

Give the importance of water in Transportation.

Additional Questions for Practice | Q 3.1

Explain how water plays an important role in the Industry.

Additional Questions for Practice | Q 3.2

Explain how water plays an important role in Agriculture.

Additional Questions for Practice | Q 4

Give the occurrence of water in the three different states i.e. solid, liquid, and gaseous.

Additional Questions for Practice | Q 5

Draw a labelled diagram to show the change of state of water from solid-state to liquid state to the gaseous state starting from ice.

Additional Questions for Practice | Q 6

Explain the term water cycle. State the main points to show how water moves from the earth’s surface to the atmosphere and back to the earth’s surface as rain

Additional Questions for Practice | Q 7

Give a reason why water is considered a universal solvent.

Additional Questions for Practice | Q 8.1

Define:
Solute

Additional Questions for Practice | Q 8.2

Define:
Solvent

Additional Questions for Practice | Q 8.3

Define the term:
Solution with reference to the addition of sodium chloride to water

Additional Questions for Practice | Q 9

Draw a neat labelled diagram of the addition of copper sulphate to water. Label solute, solvent, and solution in the same.

Additional Questions for Practice | Q 10

From the following substances given below state which will form a solution in the same.
(a) sodium carbonate
(b) calcium carbonate
(c) charcoal powder
(d) sodium sulphate
(e) table salt
(f) powdered particles of lead from a lead pencil
(g) iron powder
(h) copper filings
(i) sand particles
(j) honey

Additional Questions for Practice | Q 11.1

Name two gases which are soluble in water

Additional Questions for Practice | Q 11.2

Name two gases which are insoluble in water.

Additional Questions for Practice | Q 12

If ‘X’ g. of potassium nitrate is added to 100 g. of water at 60°C and the salt dissolves completely then :

(a) is ‘X’ g. the solubility of potassium nitrate at 60°C.
(b) is the solution formed – saturated or unsaturated
(c) if on addition ‘X’ + ‘Y’ g. of potassium nitrate to the same amount of water at the same temperature and the solute now just remains behind after stirring then –
(d) is the solution now – saturated or unsaturated
(e) is ‘X’ + ‘Y’ g. the solubility of potassium nitrate.

Additional Questions for Practice | Q 13.1

State whether the following statement is true or false. If false write the correct statement.
Solubility of most solids – decreases with increase in temperature

  • True

  • False.

Additional Questions for Practice | Q 13.2

State whether the following statement is true or false. If false write the correct statement.
Distilled water is potable water.

  • True

  • False

Additional Questions for Practice | Q 13.2

State whether the following statement is true or false. If false write the correct statement.
The process to remove germs in water is also called sterilization

  • True.

  • False.

Additional Questions for Practice | Q 14

Differentiate between chemical pollution and thermal pollution.

Additional Questions for Practice | Q 15

State some important steps to avoid pollution of water.

Additional Questions for Practice | Q 16

State what is meant by the term ‘conservation of water’.
State a few water-saving methods, which may be used in the home to conserve water.

Additional Questions for Practice | Q 17.1

Give a reason why :
Conservation of water is essential in spite of the fact that three fourth of the earth’s surface is covered by water.

Additional Questions for Practice | Q 17.2

Give a reason why :
Polluted water causes disease.

Additional Questions for Practice | Q 17.3

Give a reason why :
Drip irrigation helps in the conservation of water.

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Objective Type Questions [Page undefined]

Selina solutions for Class 6 Selina Concise Chemistry Chapter 7 Water Objective Type Questions [Page undefined]

Objective Type Questions | Q 1.1

Complete the statement by filling in the blanks with the correct words.

________ is the purest form of water. It may dissolve gases like ________forming weak acids.

(sea water/ lake water/rain water ; chlorine/ammonia/carbon dioxide)

Objective Type Questions | Q 1.2

Complete the statement by filling in the blanks with the correct words.

Water generates ______in hydroelectric power stations and ________in boilers for industrial applications.

(carbon dioxide/steam/heat/electricity)

Objective Type Questions | Q 1.3

Complete the statement by filling in the blanks with the correct words.

Water is added to the atmosphere by _____________and _____________.

(burning of fossil fuels/condensation of vapour/ respiration by living organisms/photosynthesis)

Objective Type Questions | Q 1.4

Complete the statement by filling in the blanks with the correct words.

If potassium nitrate is added to water in a beaker to give a homogeneous mixture, then potassium nitrate is referred to as the __________, water as the __________, and the homogeneous mixture as the _______.

(solution/ solute/solvent/saturated solution)

Objective Type Questions | Q 1.5

Complete the statement by filling in the blank with the correct words.

Water fit for human consumption and drinking purposes is called ____________.

  • distilled water

  • potable water

  • rain harvested water

Objective Type Questions | Q 2.01

State whether the following statement is true or false. If false, write the correct statement.

Sea water contains salts of calcium and magnesium.

  • True

  • False

Objective Type Questions | Q 2.02

State whether the following statement is true or false. If false, write the correct statement.

Water finds application as a means of transporting goods.

  • True

  • False

Objective Type Questions | Q 2.03

State whether the following statement is true or false. If false, write the correct statement.

On boiling water exists in the liquid state.

  • True

  • False

Objective Type Questions | Q 2.04

State whether the following statement is true or false. If false, write the correct statement.

Respiration uses up water from the atmosphere.

  • True

  • False

Objective Type Questions | Q 2.06

State whether the following statement is true or false. If false, write the correct statement.

Sodium carbonate and sodium sulphate do not form an aqueous solution.

  • True

  • False

Objective Type Questions | Q 2.07

State whether the following statement is true or false. If false, write the correct statement.

If ‘X’ g. of solute is added to 100 g. of water at t°C and the solution formed is a saturated solution, then ‘X’ g. is the solubility of the solute.

  • True

  • False

Objective Type Questions | Q 2.08

State whether the following statement is true or false. If false, write the correct statement.

Purification of water is carried out to remove – dissolved gases e.g. carbon dioxide and dissolved minerals like magnesium salts.

  • True

  • False

Objective Type Questions | Q 2.09

State whether the following statement is true or false. If false, write the correct statement.

Water from rivers and lakes is – potable water.

  • True

  • False

Objective Type Questions | Q 2.1

State whether the following statement is true or false. If false, write the correct statement.

Chemical pollutants include a metallic salt solution of mercury and lead.

  • True

  • False

Objective Type Questions | Q 3

Match the statements in List I, 1-10 with their correct answer in List II, A to J.

List I List II
1. Sodium carbonate and water A: Seawater
2. Chemical used in sedimentation during purification of water B: The preferred place for an organism
3. vapourisation C: Liquid state
4. Kerosene and water D: Aqueous solution
5. A solution which can dissolve more of solute at a given temperature E: Dissolved gases and minerals
6. Water as a habitat for marine life F: Unsaturated solution
7. A water-borne disease G: Immiscible mixture
8. Existence of water between 0°C and 100°C H: Liquid to a gaseous state
9. Taste in water is due to I: Dysentery
10. The most impure form of water J: Alum
Objective Type Questions | Q 4.1

Explain the meaning of the following term:

Rainwater harvesting

Objective Type Questions | Q 4.2

Explain the meaning of the following term:

Drip irrigation in agriculture

Objective Type Questions | Q 4.3

Explain the meaning of the following term:

Saturated solution

Objective Type Questions | Q 4.4

Explain the meaning of the following term:

Conservation of water

Objective Type Questions | Q 4.5

Explain the meaning of the following term:

The gaseous state of water in the air

Objective Type Questions | Q 5.1

Name the following

A chemical used during chlorination of water.

Objective Type Questions | Q 5.2

Name the following

An agricultural pollutant in water

Objective Type Questions | Q 5.3

Name the following

A solid, ‘natural form of water.

Objective Type Questions | Q 5.4

Name the following

The natural process by which circulation of water takes place from the earth’s surface to the atmosphere and back to the earth’s surface.

Objective Type Questions | Q 5.5

Name the following

The liquid or medium of dissolution which allows the solute to dissolve in it.

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Chapter 7: Water

Exercise 1Exercise 2Exercise 3Exercise 4Objective Type QuestionsMultiple Choice QuestionsAdditional Questions for Practice
Class 6 Selina Concise Chemistry - Shaalaa.com

Selina solutions for Class 6 Selina Concise Chemistry chapter 7 - Water

Selina solutions for Class 6 Selina Concise Chemistry chapter 7 (Water) 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 CISCE Class 6 Selina Concise Chemistry solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Selina textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 6 Selina Concise Chemistry chapter 7 Water are Importance of Water in Everyday Life (Household Purpose, Industry, Watering Plants, Etc.), Concept of Water Resources (Well, River, Hand Pump, Lakes, Pond, Etc.), Concept for Capacity to Dissolve Salts, Concept for Solute, Solvent and Solution, Importance of Water for Sustenance of Life on Earth, Concept for Reasons for Water Pollution, Prevention of Water Pollution, Conservation of Water.

Using Selina Class 6 solutions Water 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 Selina Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 6 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 7 Water Class 6 extra questions for Class 6 Selina Concise Chemistry and can use Shaalaa.com to keep it handy for your exam preparation

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