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Selina solutions for Class 8 Chemistry chapter 8 - Water

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

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Selina Selina Concise Chemistry - Middle School Class 8 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

Chapter 8: Water

Chapter 8: Water solutions [Page 0]

Name the four main sources of water.

 State the importance of water cycle in nature.

Why is water very precious for all living being ?

Name the two gases from which water is formed. What is the chemical composition of these two gases in water ?  

Give the molecular formula of water ?

What is the effect on boiling point of water when
pressure is increased.

What is the effect on boiling point of water when
impurity is added

Give reason:
Water is used as a cooling agent.

Give reason of Water pipes burst in severe winter.

Give reason for It is difficult to cook in hills compared to plain.

Give reason of Ice floats on water.

 Give reason for Sea water does not freeze at 0°C.

How does anomalous expansion of water help aquatic organisms in cold climates ?

Chapter 8: Water solutions [Page 0]

Explain the term of Solution .

Explain the term of  Solute.

 Explain the term of Solvent.

What is meant by Unsaturated.

What is meant by Saturated .

What is meant by Supersaturated solutions.

How do the solubility of a solid and a gas affected by Increase in temperature.

How do the solubility of a solid and a gas affected by Increase in pressure.

Differentiate between Solution and suspension

Differentiate between Suspension and colloid.

Define: ‘water of crystallisation’. Give two examples with formulae.

Give two examples  of the following Hydrated substances.

Give two examples of the following Crystalline anhydrous substances.

Give two examples of the following Drying agent.

 Give two examples for the following Deliquescent substance.

Give two examples for the following Efflorescent substance.

Give two example of the following Colloid.

Give two example of the following Solvent other than water.

What do you observe when Blue vitriol is heated ?

What do you observe when Washing soda is exposed to air ?

 What do you observe when Blue litmus solution is added to water ?

Give reason for Silica gel pouches are kept in unused water bottle.

Give reason forTable salt becomes moist during rainy season.

Give reason On opening a bottle of a cold drink, a fizz sound is heard.

Give balanced chemical equation for the reaction of water with Sodium .

Give balanced chemical equation for the reaction of water with Iron . 

Give balanced chemical equation for the reaction of water with Carbon dioxide.

Give balanced chemical equation for the reaction of water with Sodium oxide.

What is metal activity series ?

Name the gas produced when steam is passed over hot coke.

Name the gas produced when chlorine is dissolved in water and exposed to sunlight.

Name the gas produced when a piece of calcium is added to water.

Name the gas produced when fossil fuel is burnt.

Chapter 8: Water solutions [Page 0]

Define the Soft water.

Define the Hard water.

Name the compound responsible for temporary hardness.

Name the compound responsible for permanent hardness of water.

Suggest one method for the removal along with the reaction for permanent hardness of water.

Suggest one method for the removal along with the reaction for temporary hardness.

Name three water borne diseases.

What are the main causes of water pollution ? How can it be controlled ?

Give reason  of Alcohol is mixed with water and is used in car radiator.

Give reason of Icebergs float on ocean water.

Give reason of Carbonated drinks are bottled under high pressure.

Chapter 8: Water solutions [Page 0]

Fill in the blank. 

Water has...................... density and .................. volume at 4°C.

Fill in the blank. 

Freezing mixture contains........and .............

 Fill in the blank.

The solubility of a gas in water.............. with rise in temperature and.......................with rise in pressure.

Fill in the blank.

.................... is the purest form of natural water.

Fill in the blank :

Use of excessive....................y farmers causes water pollution.

Fill in the Blank :

Boiling removes the ................ hardness of water.

Fill in the blank:

Water turns the colour of anhydrous copper sulphate.................

Fill in the blank:

Water turns the colour of anhydrous copper sulphate ...........

 Match the statements in column A with that in column B.

 Column A  Column B
 (a) deliquescent substance (1) sodium bicarbonate
 (b) hygroscopic substance (2) magnesium chloride
 (c) efflorestance substance (3) conc. sulphuric acid
 (d) substance causing temporary hardness (4) washing soda

Give one word for the following statement:

Water fit for human consumption .

Give one word  for the following statement:

The harmful substances dissolved in water .

Give one word for the following statement :

The change of states of water from one form to another .

Give one word  for the following statement:

The gaseous form of water found in air .

Give one word for the following statement:

A mixture of common salt and ice .

Give one word for the following statement:

A substance which does not contain water .

Give one word for the following statement:

A property due to which a substance absorbs water without dissolving.

Give one word for the following statement:

Water molecules in loose chemical combination with other substances.

Chapter 8: Water solutions [Page 0]

Two gases found dissolved in natural water are
(a) oxygen and carbon dioxide
(b) hydrogen and oxygen
(c) sulphur dioxide and hydrogen
(d) chlorine and ammonia

Temporary hardness of water can be removed by
(a) filtering
(b) boiling
(c) loading
(d) none of the above

The ultimate source of all water on the earth is
(a) oceans and seas
(b) spring and wells
(c) rivers and lakes
(d) rain

Colloids have the particle size range between
(a) 10-7 to 10-10 m
(b) 10-10 to 10-12 m
(c) 10-7 to 10-5 m
(b) 10-12 to 10-15 m

Chapter 8: Water solutions [Page 0]

What is the smallest particle of water ? Describe it’s structure.

Describe the water-cycle in nature.

How are natural springs of water formed ?

Why is sea water salty ?

Discuss the importance of water as a solvent for our body .

Discuss the importance of water as a solvent for plants.

What do you mean by solubility of a solute in a solvent ?

Give any three important uses of water.

Explain how the peculiar variation of density of water with temperature can protect marine-life.

Explain how the peculiar variation of density of water with temperature can cause water— pipes to burst in very cold places.

A captain of ship will tell you that an iceberg is much bigger than it looks. Why is it so ?

Why is water used in hot-water bottles ?

What do you mean by a saturated solution ?

Answer the following question:

Why is acid added to water before electrolysis ?

Answer the following question:

What is the chemical composition of water ? Give its molecular formula.

How does anomalous expansion of water help aquatic organisms in cold climates ?

Answer the following question:

Name two gases dissolved in natural water.

What do you mean by water pollution ?

What are its causes and how can water pollution be controlled ?

Give balanced chemical equations to show the reaction between Coke and steam.

Give balanced chemical equations to show the reaction between Magnesium and water.

Chapter 8: Water

Selina Selina Concise Chemistry - Middle School Class 8 (2018-19 Session)

Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session)

Selina solutions for Class 8 Chemistry chapter 8 - Water

Selina solutions for Class 8 Chemistry chapter 8 (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 Selina Concise Chemistry - Middle School for Class 8 (2018-19 Session) solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com are providing 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 8 Chemistry chapter 8 Water are Dissolution of Salts in Water, Concept of Universal Solvent, Solutions, Suspensions, Colloids, Differentiate Unsaturated/Saturated and Supersaturated Solutions, Water of Crystallisation, Hydrated and Anhydrous Substances, Hygroscopic, Reactivity of Metals with Cold Water, Hot Water and Steam (With Products Formed)., Hard and Soft Water and Methods of Softening of Hard Water, Removing hardness of water by boiling or by treating with washing soda, Concept for Water.

Using Selina Class 8 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 8 prefer Selina Textbook Solutions to score more in exam.

Get the free view of chapter 8 Water Class 8 extra questions for Chemistry and can use Shaalaa.com to keep it handy for your exam preparation

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