Water - ICSE STD 7 CHEMISTRY Questions - Vidyadip

Question types

Water question types

60 questions across 10 question groups — pick any mix to generate a CHEMISTRY paper with step-by-step answer keys.

60

Questions

10

Question groups

5

Question types

MCQ

[1 Mark Question Answer]

[2 Mark Question Answer]

[3 Mark Question Answer]

[5 Mark Question Answer]

Fill in the blanks.

TRUE / FALSE

Match The Following.

Do as Directed.

Draw the diagram of the following.

Sample Questions

Water questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ1 Mark

The content of dissolved oxygen decreases with increase of

A
pressure
✓
temperature
C
moisture
D
all of these

Answer: B.

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Q 2MCQ1 Mark

Which of the following does not cause hardness of water?

A
Calcium bicarbonate
✓
Sodium bicarbonate
C
Magnesium chloride
D
Calcium sulphate

Answer: B.

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Q 3MCQ1 Mark

The presence of bicarbonates of calcium and magnesium causes

✓
temporary hardness of water
B
permanent hardness of water
C
temporary and permanent hardness of water
D
none of these

Answer: A.

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Q 4MCQ1 Mark

Temporary hardness of water can be removed by

A
freezing
✓
boiling
C
melting
D
all of these

Answer: B.

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Q 5MCQ1 Mark

Water reacts with carbon dioxide to form

✓
carbonic acid
B
sulphuric acid
C
hydrochloric acid
D
none of these

Answer: A.

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Q 6[1 Mark Question Answer]1 Mark

Hard water is unfit for washing purposes.

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Q 7[1 Mark Question Answer]1 Mark

What is ozonization ?

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Q 8[1 Mark Question Answer]1 Mark

Which chemical is used for chlorination of water ?

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Q 9[1 Mark Question Answer]1 Mark

Name some dissolved impurities in water.

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Q 10[1 Mark Question Answer]1 Mark

Name some sources of surface water.

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Q 11[2 Mark Question Answer]2 Marks

Pressure cooker should be used for cooking

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Q 12[2 Mark Question Answer]2 Marks

What is loading ?

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Q 13[2 Mark Question Answer]2 Marks

Define water cycle. Give its other name.

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Q 14[2 Mark Question Answer]2 Marks

What is groundwater ? State its two main sources.

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Q 15[3 Mark Question Answer]3 Marks

Rainwater harvesting has become important these days.

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Q 16[3 Mark Question Answer]3 Marks

Water pipes sometimes burst during severe winter.

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Q 17[5 Mark Question Answer]4 Marks

State any five methods to cheek water pollution.

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Q 18[5 Mark Question Answer]4 Marks

What is water pollution ? Mention three causes for water pollution.

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Q 19[5 Mark Question Answer]4 Marks

How does washing soda remove hardness of water ? Write associated chemical equations.

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Q 20[5 Mark Question Answer]4 Marks

Explain ‘anomalous expansion of water’ and its significance.

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Q 21[5 Mark Question Answer]4 Marks

Describe experimentally with the help of a labelled diagram, the determination of the boiling point of pure water.

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Q 22Fill in the blanks.1 Mark

Temporary hardness of water can be removed by ____________ which decomposes the soluble _______________ present in the water.

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Q 23Fill in the blanks.1 Mark

The ______________ expansion of water helps aquatic animals to survive in frozen ponds or lakes in winter.

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Q 24Fill in the blanks.1 Mark

The density of water is maximum at ____________

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Q 25Fill in the blanks.1 Mark

Pure water is a __________ conductor of heat and electricity.

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Q 26Fill in the blanks.1 Mark

The presence of impurities in water __________ the boiling point and __________ the freezing point of water.

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Q 27TRUE / FALSE1 Mark

Aquatic animals like fish use oxygen from the atmosphere for respiration.

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Q 28TRUE / FALSE1 Mark

Alcohol is immiscible in water whereas petrol is miscible in water.

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Q 29TRUE / FALSE1 Mark

Chemically pure water is called distilled water.

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Q 30TRUE / FALSE1 Mark

Ice at 0°C has a lower density than water at 4°C and hence it floats on water.

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Q 31TRUE / FALSE1 Mark

Pure water has its maximum density at 0°C.

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Q 32Match The Following.4 Marks

Column A	Column B
1. Dissolved salts of calcium and magnesium	a. increases the rate of sedimentation of suspended impurities
2. Potash alum	b. hardness of water
3. Bleaching powder	c. 4°C
4. Maximum density of water	d. lathers well with soap
5. Soft water	e. disinfectant

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Q 33Do as Directed.1 Mark

Complete and balance the equations. $MgSO_4 + Na_2CO_3 \rightarrow $

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Q 34Do as Directed.1 Mark

Complete and balance the equations. $CaCl_2 + Na_2CO_3 \rightarrow$

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Q 35Do as Directed.1 Mark

Complete and balance the equations. $Ca(HCO_3)_2$heat

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Q 36Do as Directed.1 Mark

Complete and balance the equations. $SO_3 + H_2O \rightarrow $

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Q 37Do as Directed.1 Mark

Complete and balance the equations. $MgO + H_2O \rightarrow $

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Q 38Draw the diagram of the following.3 Marks

To show the process of purification of water in waterworks

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