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Chemistry revision - Water

Total questions: 40

Worksheet time: 30secs

Name
Class
Date
1.

Water is a …

a)

Compound

b)

Element

c)

Complex

d)

Atom

2.

What is the reaction of water with litmus?

a)

Acidic

b)

Basic

c)

Neutral

d)

Destroys litmus

3.

In which year, Henry Cavendish name a gas ‘inflammable air’?

a)

1871

b)

1766

c)

1718

d)

1817

4.

In Hoffman Volta-meter, where is O2 and H2 collected?

a)

Anode, Cathode

b)

Cathode, Anode

c)

Anode, Middle

d)

Outside, Cathode

5.

What is the chemical name of water?

a)

Dihydrogen oxide

b)

Dihydrogen dioxide

c)

Hydrogen dioxide

d)

Hydrogen oxide

6.

What is the IUPAC name of water?

a)

Dihydrogen oxide

b)

Water

c)

Oxidane

7.

What is the full form of IUPAC?

a)

International union of perfect and absolute chemistry

b)

International union of pure and applied chemistry

c)

Indian unity of particular and artificial chemistry

d)

International unite of practical and atomic chemistry

8.

All substances can dissolve in water.

a)

True

b)

False

9.

Hydrogen collected in Hoffman Volta-meter is double the amount of oxygen collected.

a)

True

b)

False

10.

Henry Cavendish conducted experiments reacting___with___acid.

a)

Copper, nitric

b)

Iron, hydrochloric

c)

Aluminium, phosphoric

d)

Zinc, sulphuric

11.

The electrical conductivity of water___with an increase in the number of ions.

a)

Decreases

b)

Increases

c)

Remains same

d)

Ends

12.

Water is a___solvent.

a)

Universal

b)

Standard

c)

Negligible

d)

International

e)

All-rounder

13.

Slaked lime is used in___.

a)

Clark’s process

b)

Chelation

c)

Filtration

d)

Formation of slimes

14.

What is the ratio of hydrogen to oxygen by mass?

a)

8:1

b)

1:2

c)

2:1

d)

1:8

15.

What is the volumetric composition of hydrogen and oxygen atoms in the molecule of water?

a)

8:1

b)

2:1

c)

1:2

d)

1:8

16.

in Hoffman volta-meter, what are the electrodes made up of?

a)

Iron

b)

Platinum

c)

Gold

d)

Graphite

17.

What are the ways by which water can be formed?

a)

Burning hydrogen in air

b)

Reducing metal oxides by hydrogen

c)

Reacting metals and acids

d)

Burning hydrocarbons in air

e)

Burning coal in air

18.

Water has the property of turning anhydrous white copper sulphate crystals to ___.

a)

Blue

b)

Green

c)

Yellow

d)

Red

19.

Plants can grow in pure water.

a)

True

b)

False

20.

What is the boiling point of water at Mount Everest?

a)

100°C

b)

92°C

c)

50°C

d)

71°C

21.

What is the Phenomenon of water of expansion in volume at low temperature called as?

a)

Weird behaviour of water

b)

Anomalous expansion of water

c)

Magic

d)

Unnatural expansion of water

22.

Pure water is bad conductor of?

a)

Heat

b)

Electricity

c)

Both heat and electricity

d)

Pure water is good conductor of heat and electricity

23.

What is the optimum temperature to decompose water into its constituents?

a)

100°C

b)

1000°C

c)

0°C

d)

2000°C

24.

Hard water contains salts of which elements?

a)

Calcium

b)

Magnesium

c)

Maybe iron

d)

All of the above

25.

Temporary hardness of water is temporary as___can displace such ions from water in order to remove its hardness.

a)

Boiling

b)

Freezing

c)

Both boiling and freezing

d)

None of the above

26.

Complete the equation:–

 Ca(HCO3)2 ———> ____ + CO2 + H2O

a)

CaCO3

b)

MgCO3

c)

Ca

d)

Ca(HCO3)2

27.

Which of the following are advantages of hard water?

a)

Hard water causes fading and yellowing of clothes.

b)

Calcium irons in hard water reacts with soap to form soap scum.

c)

Both A and B

d)

None of the above

28.

Which of the following are disadvantages of soft water?

a)

Soft water has a high amount of sodium which is harmful to the body.

b)

Low mineral content of soft water creates mineral imbalance in body.

c)

Both a and b

d)

None of the above

29.

___Is the measure of the amount of concentration of solid impurities in the water which are found in the form of salts of sodium, calcium, nitrates etc.

a)

TDS(Total dissolved solids)

b)

TDS(Total dissolved substances)

c)

Conductivity

d)

pH

30.

Which of the following are the methods to soften hard water?

a)

Boiling

b)

Clark’s process

c)

Addition of washing soda

d)

Adding any acid

31.

Which are the insoluble precipitates that separate after softening temporary hard water?

a)

CaCO3

b)

MgCO3

c)

CaSO4

d)

MgSO4

e)

None of the above

32.

Water can be polluted by natural causes too.

a)

True

b)

False

33.

Which of the following are causes of chemical pollution of water?

a)

Agriculture

b)

Transportation

c)

Domestic Sewage

d)

All of the above

34.

___Is the process of employing different methods in order to remove impurities or contamination from a substance.

a)

Purification

b)

Pollution

c)

Irrigation

d)

None of the above

35.

Which of the following are types of impurities present in water?

a)

Impurities that remain suspended in water like sand, sewage charge and organic matter.

b)

Impurities that are dissolved like solids and gases.

c)

Microorganisms in water.

d)

Substances that improve the quality of water.

e)

Plants that grow in water dot

36.

Which of the following are methods to remove suspended impurities?

a)

Loading

b)

Boiling

c)

Chlorination

d)

Sedimentation

e)

Filtration

37.

Which of the following are the methods to destroy harmful microorganisms present in water?

a)

Loading

b)

Boiling

c)

Chlorination

d)

Sedimentation

e)

Filtration

38.

(a)   is used as electrode in Hoffmann voltammeter for electrolysis of water

39.

In electrolysis of water we get (a)   at anode

40.

In preperation of water by burning dry hydrogen, the role of anydrous calcium chloride is to (a)  

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