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Selina solutions for Concise Chemistry Class 8 ICSE chapter 8 - Water [Latest edition]

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Concise Chemistry Class 8 ICSE - Shaalaa.com

Chapter 8: Water

Exercise-IExercise-IIExercise-IIIObjective Type QuestionsMultiple Choice Questions

Exercise-I [Page 107]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 8 Water Exercise-I [Page 107]

Exercise-I | Q 1 | Page 107

Name the four main sources of water.

Exercise-I | Q 2 | Page 107

 State the importance of water cycle in nature.

Exercise-I | Q 3 | Page 107

Why is water very precious for all living being ?

Exercise-I | Q 4.1 | Page 107

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

Exercise-I | Q 4.2 | Page 107

Give the molecular formula of water ?

Exercise-I | Q 5.1 | Page 107

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

Exercise-I | Q 5.2 | Page 107

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

Exercise-I | Q 6.1 | Page 107

Give reason:
Water is used as a cooling agent.

Exercise-I | Q 6.2 | Page 107

Give reason of Water pipes burst in severe winter.

Exercise-I | Q 6.3 | Page 107

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

Exercise-I | Q 6.4 | Page 107

Give reason of Ice floats on water.

Exercise-I | Q 6.5 | Page 107

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

Exercise-I | Q 7 | Page 107

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

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Exercise-II [Page 115]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 8 Water Exercise-II [Page 115]

Exercise-II | Q 1.1 | Page 115

Explain the term of Solution .

Exercise-II | Q 1.2 | Page 115

Explain the term of  Solute.

Exercise-II | Q 1.3 | Page 115

 Explain the term of Solvent.

Exercise-II | Q 2.1 | Page 115

What is meant by Unsaturated.

Exercise-II | Q 2.2 | Page 115

What is meant by Saturated .

Exercise-II | Q 2.3 | Page 115

What is meant by Supersaturated solutions.

Exercise-II | Q 3.1 | Page 115

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

Exercise-II | Q 3.2 | Page 115

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

Exercise-II | Q 4.1 | Page 115

Differentiate between Solution and suspension

Exercise-II | Q 4.2 | Page 115

Differentiate between Suspension and colloid.

Exercise-II | Q 5 | Page 115

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

Exercise-II | Q 6.1 | Page 115

Give two examples of Hydrated substances.

Exercise-II | Q 6.2 | Page 115

Give two examples of Crystalline anhydrous substances.

Exercise-II | Q 6.3 | Page 115

Give two examples of Drying agent.

Exercise-II | Q 6.4 | Page 115

 Give two examples for Deliquescent substance.

Exercise-II | Q 6.5 | Page 115

Give two examples for Efflorescent substance.

Exercise-II | Q 6.6 | Page 115

Give two example of Colloid.

Exercise-II | Q 6.7 | Page 115

Give two example of Solvent other than water.

Exercise-II | Q 7.1 | Page 115

What do you observe when Blue vitriol is heated ?

Exercise-II | Q 7.2 | Page 115

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

Exercise-II | Q 7.3 | Page 115

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

Exercise-II | Q 8.1 | Page 115

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

Exercise-II | Q 8.2 | Page 115

Give reason for Table salt becomes moist during rainy season.

Exercise-II | Q 8.3 | Page 115

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

Exercise-II | Q 9.1 | Page 115

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

Exercise-II | Q 9.2 | Page 115

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

Exercise-II | Q 9.3 | Page 115

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

Exercise-II | Q 9.4 | Page 115

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

Exercise-II | Q 10 | Page 115

What is metal activity series ?

Exercise-II | Q 11.1 | Page 115

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

Exercise-II | Q 11.2 | Page 115

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

Exercise-II | Q 11.3 | Page 115

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

Exercise-II | Q 11.4 | Page 115

Name the gas produced when fossil fuel is burnt.

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Exercise-III [Pages 120 - 121]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 8 Water Exercise-III [Pages 120 - 121]

Exercise-III | Q 1.1 | Page 120

Define the Soft water.

Exercise-III | Q 1.2 | Page 120

Define the Hard water.

Exercise-III | Q 2.1 | Page 120

Name the compound responsible for temporary hardness.

Exercise-III | Q 2.1 | Page 120

Name the compound responsible for permanent hardness of water.

Exercise-III | Q 2.2 | Page 120

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

Exercise-III | Q 2.2 | Page 120

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

Exercise-III | Q 3 | Page 120

Name three water borne diseases.

Exercise-III | Q 4 | Page 121

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

Exercise-III | Q 5.1 | Page 121

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

Exercise-III | Q 5.2 | Page 121

Give reason of Icebergs float on ocean water.

Exercise-III | Q 5.3 | Page 121

Give reason of Carbonated drinks are bottled under high pressure.

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Objective Type Questions [Page 121]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 8 Water Objective Type Questions [Page 121]

Objective Type Questions | Q 1.1 | Page 121

Fill in the blank. 

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

Objective Type Questions | Q 1.2 | Page 121

Fill in the blank. 

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

Objective Type Questions | Q 1.3 | Page 121

 Fill in the blank.

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

Objective Type Questions | Q 1.4 | Page 121

Fill in the blank.

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

Objective Type Questions | Q 1.5 | Page 121

Fill in the blank :

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

Objective Type Questions | Q 1.6 | Page 121

Fill in the Blank :

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

Objective Type Questions | Q 1.7 | Page 121

Fill in the blank:

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

Objective Type Questions | Q 1.8 | Page 121

Fill in the blank:

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

Objective Type Questions | Q 2 | Page 121

 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
Objective Type Questions | Q 3.1 | Page 121

Give one word for the following statement:

Water fit for human consumption .

Objective Type Questions | Q 3.2 | Page 121

Give one word  for the following statement:

The harmful substances dissolved in water .

Objective Type Questions | Q 3.3 | Page 121

Give one word for the following statement :

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

Objective Type Questions | Q 3.4 | Page 121

Give one word  for the following statement:

The gaseous form of water found in air .

Objective Type Questions | Q 3.5 | Page 121

Give one word for the following statement:

A mixture of common salt and ice .

Objective Type Questions | Q 3.6 | Page 121

Give one word for the following statement:

A substance which does not contain water .

Objective Type Questions | Q 3.7 | Page 121

Give one word for the following statement:

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

Objective Type Questions | Q 3.8 | Page 121

Give one word for the following statement:

Water molecules in loose chemical combination with other substances.

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Multiple Choice Questions [Page 121]

Selina solutions for Concise Chemistry Class 8 ICSE Chapter 8 Water Multiple Choice Questions [Page 121]

Multiple Choice Questions | Q 1 | Page 121

Two gases found dissolved in natural water are

  • oxygen and carbon dioxide

  • hydrogen and oxygen

  • sulphur dioxide and hydrogen

  • chlorine and ammonia

Multiple Choice Questions | Q 2 | Page 121

Temporary hardness of water can be removed by

  • filtering

  • boiling

  • loading

  • none of the above

Multiple Choice Questions | Q 3 | Page 121

The ultimate source of all water on the earth is

  • oceans and seas

  • spring and wells

  • rivers and lakes

  • rain

Multiple Choice Questions | Q 4 | Page 121

Colloids have the particle size range between

  • 10-7 to 10-10 m

  • 10-10 to 10-12 m

  • 10-7 to 10-5 m

  • 10-12 to 10-15 m

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Chapter 8: Water

Exercise-IExercise-IIExercise-IIIObjective Type QuestionsMultiple Choice Questions
Concise Chemistry Class 8 ICSE - Shaalaa.com

Selina solutions for Concise Chemistry Class 8 ICSE chapter 8 - Water

Selina solutions for Concise Chemistry Class 8 ICSE 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 Concise Chemistry Class 8 ICSE 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 Concise Chemistry Class 8 ICSE 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 Concise Chemistry Class 8 ICSE and can use Shaalaa.com to keep it handy for your exam preparation

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