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Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 3 - Water [Latest edition]

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Class 9 Simplified ICSE Chemistry - Shaalaa.com

Chapter 3: Water

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Exercise

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 3 Water Exercise

Exercise | Q 1.1

Name one substance which is ‘deliquescent’.

Exercise | Q 1.2

How does an increase in temperature affect the solubility of NaCl?

Exercise | Q 1.2

How does an increase in temperature affect the solubility of CaSO4 in water?

Exercise | Q 2

Give reason for Table salt becomes moist during rainy season.

Exercise | Q 2

Give reason for white power forms on the surface of washing soda crystals which are left exposed to the air.

Exercise | Q 3

Name a salt which contain of crystallization.

Exercise | Q 3

Name a salt which does not contain.

Exercise | Q 4

Name a deliquescent substance’.

Exercise | Q 5.1

Explain the following observation:

Washing-soda become coated with a white powder when left exposed to the atmosphere.

Exercise | Q 5.1

Explain the following observation:

In the expression anhydrous copper sulphate, what is meant by “anhydrous”?

Exercise | Q 5.1

Explain the following observation:

Why is fused calcium chloride or cone, sulphuric acid used in a desiccator?

Exercise | Q 5.2

Complete the following:

The solubility of a gas at constant pressure may be increased by decreasing the

Exercise | Q 6.1

What is ‘water of crystallization’ ? Name a crystalline salt which does not contain water of crystallization.

Exercise | Q 6.2

What would you observe, when the water of crystallization of a salt Is removed by heating it.

Exercise | Q 6.3

Define the following term: Efflorescence.

Exercise | Q 6.3

Define the following term: Hygroscopy.

Exercise | Q 6.4

What is the effect of temperature on the solubility of KNO, and calcium sulphate in water?

Exercise | Q 7.1

What test would you do to find out whether a given solution is saturated or unsaturated.

Exercise | Q 7.2

How can you increase the solubility of a given volume of gas in water?

Exercise | Q 8.1

Define ‘eutrophication’.

Exercise | Q 8.2

What is meant by the term ‘oil spill’.

Exercise | Q 9.1

State any two sources of water pollution.

Exercise | Q 9.2

State the causes and consequences of ‘eutrophication’.

Exercise | Q 9.3

What is meant by the term ‘offshore drilling’. State the main environmental effects of offshore drilling.

Exercise | Q 9.4

Explain why oil spills have an adverse effect on marine life.

Exercise | Q 10

Explain any two environmental impacts of an ‘oil spill’.

Exercise | Q 11

Explain the methods of controlling water pollution.

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Additional Questions

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 3 Water Additional Questions

Additional Questions | Q 1

State the importance of water for all general uses.

Additional Questions | Q 2

How does it occur in the free state and in the combined state.

Additional Questions | Q 3

State a reason to prove that water is a compound and not a element.

Additional Questions | Q 4

State why ‘Water is considered a universal solvent’. Give the reason for the same.

Additional Questions | Q 5.1

Define the term – solute

Additional Questions | Q 5.2

Define the term – solvent

Additional Questions | Q 5.3

Define the term solution.

Additional Questions | Q 6

State the characteristics of a true solution.

Additional Questions | Q 7

Differentiate between unsaturated, saturated & supersaturated solutions.

Additional Questions | Q 8

How would you convert a saturated solution to an unsaturated solution and vice versa?

Additional Questions | Q 9

Define solubility. Give the main steps with the calculations involved of the method to determine the solubility of a given salt ‘X’ in water.

Additional Questions | Q 10.1

From the following list of salts: Na2SO4, 10H2O, NaCl, KClO3, NaNO3, Ca(OH)2, NH4Cl, KCI, CaSO4.

State the salts whose solubility increases with a rise in temperature of the water.

Additional Questions | Q 10.2

From the following list of salts: Na2SO4, 10H2O, NaCl, KClO3, NaNO3, Ca(OH)2, NH4Cl, KCI, CaSO4.

State the salts whose solubility decreases with a rise in temperature of the water.

Additional Questions | Q 10.3

From the following list of salts: Na2SO4, 10H2O, NaCl, KClO3, NaNO3, Ca(OH)2, NH4Cl, KCI, CaSO4.

State the salts whose solubility is fairly independent or slightly increases with a rise in temperature of the water.

Additional Questions | Q 11

What is a solubility curve. State two applications and two benefits of the solubility curve.

Additional Questions | Q 12.1

Give the influence of pressure.

Additional Questions | Q 12.2

Give the influence of temperature on the solubility of gases in water.

Additional Questions | Q 13.1

State the reason why boiled water tastes flat.

Additional Questions | Q 13.2

State the reason why a soda water bottle opens with a ‘fizz’.

Additional Questions | Q 14.1

What is meant by the term crystal?

Additional Questions | Q 14.2

What is meant by the term crystallization?

Additional Questions | Q 14.3

What is meant by the term seed crystal.

Additional Questions | Q 15

Define the term ‘water of crystallization’.

Additional Questions | Q 16

Differentiate between hydrated and anhydrous crystals with examples. State three defined changes that occur when hydrated copper sulphate is heated.

Additional Questions | Q 17

Washing soda and iron [III] chloride are separately exposed to the atmosphere. State

  1. the observations seen
  2. the phenomenon which occurs
  3. the reason for the phenomenon occurring in each case.

Would a similar phenomenon occur in case of exposure of common salt. Explain giving reasons.

Additional Questions | Q 18

Why is fused calcium chloride and not potassium chloride kept in a desiccator?

Additional Questions | Q 19

How does fused calcium chloride differ from iron [III] chloride when exposed to the atmosphere?

Additional Questions | Q 20

Cone H2SO4 acts as a ‘drying agent’ & a ‘dehydrating agent’. Explain and differentiate the words in italics.

Additional Questions | Q 21

Explain the meaning of the terms – hard water & soft water.

Additional Questions | Q 22

State the causes of hardness in water.

Additional Questions | Q 23

Give two natural sources of hard water.

Additional Questions | Q 24

Differentiate between Temporary & permanent hard water with suitable examples.

Additional Questions | Q 25

What causes the temporary and permanent hardness of water?

Additional Questions | Q 26

State the disadvantages of using hard water.

Additional Questions | Q 27.1

Give reason for the following:

Hardness in temporary water can be removed by boiling, but hardness in permanent hard water cannot.

Additional Questions | Q 27.2

Give balanced equation to show how temporary hardness in water can be removed by boiling.

Additional Questions | Q 28

Both temporary & permanent hardness in water can be removed by addition of washing soda. Give balanced equations for the same.

Additional Questions | Q 29

A sample of water is given in a trough. State how would you prove experimentally whether the given sample is hard water or soft water.

Additional Questions | Q 30

Two samples of water are placed in a beaker individually. State how you will determine experimentally which of the two samples contains permanent hard water.

Additional Questions | Q 31

State what are synthetic detergents. Explain experimentally how you will determine the advantage of synthetic detergents over soap using a sample of hard water.

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Water

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry Chapter 3 Water Water

Water | Q 1.1

Select the correct word from the words in option to complete the sentence:

If pressure on the surface of water increases its boiling point ____ and freezing point ____.

  • increases, decreases

  • decreases, increases

Water | Q 1.2

Select the correct word from the words in option to complete the sentence:

A saturated solution can be converted to an unsaturated solution by ____ the amount of the solvent.

  • increasing

  • decreasing

Water | Q 1.3

Select the correct word from the words in option to complete the sentence:

Dissolved air in water contains a ____ percentage of oxygen than ordinary air.

  • higher

  • lower

Water | Q 1.4

Select the correct word from the words in option to complete the sentence:

At low temperatures, the solubility of a gas in water is ____ compared to that at ordinary temperatures.

  • More

  • Less

Water | Q 1.5

Select the correct word from the words in option to complete the sentence:

Efflorescence occurs when the vapour pressure of the hydrated crystals is ____ than the vapour pressure of the atmospheric humidity.

  • more

  • less

Water | Q 2.1

Select the correct answer from the choice given in the options.

An anhydrous crystal _____.

  • blue vitriol

  • epsom salt

  • lead chloride

Water | Q 2.2

Select the correct answer from the choice given in the options.

A substance which causes hardness in water _____.

  • NH4Cl

  • CaCl2

  • NaCl

Water | Q 2.3

Select the correct answer from the choice given in the options.

A deliquescent salt of a divalent metal _____.

  • CuCl

  • CaCl2

  • FeCl2

  • PbCl2

Water | Q 2.4

Select the correct answer from the choice given in the options.

An anhydrate of a heptahydrate salt _____.

  • Cu(N03)2

  • Ca(NO3)2

  • FeSO4

  • CaSO4

Water | Q 2.5

Select the correct answer from the choice given in the options.

A drying agent, deliquescent in nature used in a dessicator ______.

  • cone. H2SO4

  • fused CaCl2FeCl3

Water | Q 3.1

Give reason for the following:

Solubility curves find utility in separation and purification of solutes.

Water | Q 3.2

Give a reason for the following:

Pressure and temperature influence the solubility of gases in water.

Water | Q 3.3

Give a reason for the following:

Heating a hydrated copper sulphate crystal is deemed a chemical change.

Water | Q 3.4

Give a reason for the following:

Efflorescence is minimum during humid conditions.

Water | Q 3.5

Give a reason for the following:

A crusty ‘boiler scale’ is formed in boilers, when hard water is used.

Water | Q 4.1

Name or state the following:

An efflorescent decahydrate salt.

Water | Q 4.2

Name or state the following:

A deliquescent salt of a trivalent metal.

Water | Q 4.3

Name or state the following:

A liquid hydroscopic substance.

Water | Q 4.4

Name or state the following:

A salt whose solubility decreases with rise in temperature of the solvent water.

Water | Q 4.5

Name or state the following:

A substance added to remove both temporary and permanent hardness in water.

Water | Q 5.1

Differentiate between the following:

Natural water and treated water

Water | Q 5.2

Differentiate between the following:

Saturated solution and a supersaturated solution

Water | Q 5.3

Differentiate between the following:

Solubility and solubility curve

Water | Q 5.4

Differentiate between the following:

Deliquescent salt and hygroscopic salt

Water | Q 5.5

Differentiate between the following:

Solute and solvent – forming a solution.

Water | Q 6

Match the terms in List I with the correct answers in List II.

List I List II
1. Solubility in a given solvent decreases with an increase in temperature. A: Na2SO4.10H2O
2. A white efflorescent crystal B: NaOH
3. A hygroscopic dehydrating agent C: Ca(HCO3)2
4. A deliquescent alkali D: conc. H2SO4
5. A substance present in temporary hard water E: CaSO4 
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Chapter 3: Water

ExerciseAdditional QuestionsWater
Class 9 Simplified ICSE Chemistry - Shaalaa.com

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 3 - Water

Viraf J. Dalal solutions for Class 9 Simplified ICSE Chemistry chapter 3 (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 9 Simplified ICSE 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. Viraf J. Dalal textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 9 Simplified ICSE Chemistry chapter 3 Water are Water as a Compound and as a Universal Solvent, Physical and Chemical Properties of Water, Solutions as 'Mixtures' of Solids in Water, Saturated Solutions, Concept for Water, Concept of Universal Solvent, Concentration of a Solution, Solubility, Crystals and Crystallisation, Hydrated and Anhydrous Substances, Hygroscopic, Qualitative Effect of Temperature on Solubility, Introduction of Water Pollution and Its Control, Properties, Drying and Dehydrous Substances, Hard and Soft Water and Methods of Softening of Hard Water, Types of Hardness: Temporary Hardness and Permanent Hardness, Dissolution of Salts in Water, General Properties of Salts:, Concept for Solute, Solvent and Solution, Hard and Soft Water.

Using Viraf J. Dalal Class 9 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 Viraf J. Dalal Solutions are important questions that can be asked in the final exam. Maximum students of CISCE Class 9 prefer Viraf J. Dalal Textbook Solutions to score more in exam.

Get the free view of chapter 3 Water Class 9 extra questions for Class 9 Simplified ICSE Chemistry and can use Shaalaa.com to keep it handy for your exam preparation

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