Hardness Of Water : Chemistry MCQ Practice Questions & Answers (Hindi) - Page 2

ChemistryEasyHardness Of Water

21.

The formula of chloramine is

A

$ClNH_2$

B

$NHCl_2$

C

$NCl_3$

D

$NH_2Cl_2$

ChemistryEasyHardness Of Water

22.

The external treatment of boiler feed water is done by

A

Lime – soda process

B

sodium sulphate treatment

C

Calgon process

D

sodium aluminate treatment.

ChemistryEasyHardness Of Water

23.

The common methods used for disinfection in waste water treatment plants are

A

Chlorination

B

UV light

C

Both a & b

D

Phenolic solvent

ChemistryEasyHardness Of Water

24.

Temporary hardness of water is caused by the presence of

A

Chlorides of calcium and magnesium

B

Sulfates of calcium and magnesium

C

Bicarbonates of calcium and magnesium

D

Carbonates of calcium and magnesium.

ChemistryEasyHardness Of Water

25.

Temporary hardness in water is removed by

A

Filtration

B

Sedimentation

C

Boiling

D

coagulation.

ChemistryEasyHardness Of Water

26.

Solubility of calcium sulphate in water is

A

Increase with rise of temperature

B

Decreases with rise of temperature

C

Remains unaltered with rise of temperature

D

Does not adopt any definite pattern with rise of temperature.

ChemistryEasyHardness Of Water

27.

Permanent hardness in water is caused by the presence of

A

Bicarbonates of calcium and magnesium

B

Carbonates of sodium and potassium

C

Chlorides of sulfates and calcium and magnesium

D

Phosphates of sodium and potassium

ChemistryEasyHardness Of Water

28.

One part of $CaCO_3$ equivalent hardness per 105 parts of water is called

A

Degree Clarke

B

ppm

C

degree French

D

mg /L

ChemistryEasyHardness Of Water

29.

One of the following is an example for cation exchanging resin

A

Copolymer of phenol formaldehyde – amine formaldehyde

B

Copolymer of styrene – divinyl benzene

C

Copolymer of phenol formaldehyde and styrene

D

Copolymer of amine formaldehyde and divinely benzene

ChemistryEasyHardness Of Water

30.

Liquid chlorine is a most effective

A

Disinfectant

B

coagulant

C

floculant

D

sterilizing agent

ChemistryEasyHardness Of Water

31.

Hardness of water is measured in

A

Degree Clarke

B

ppm

C

degree French

D

mg /L

ChemistryEasyHardness Of Water

32.

Hardness of water is expressed in equivalents of

A

$CaCO_3$

B

$MgCO_3$

C

$Ca(HCO_3)_2$

D

$Mg(HCO_3)_2$

ChemistryEasyHardness Of Water

33.

Hardness of water does not

A

Make it unfit for drinking

B

cause difficulty in washing clothes with soaps.

C

Have any bad effect in boiler

D

make cooking of food difficult

ChemistryEasyHardness Of Water

34.

Hardness in water is caused due to the presence of

A

Dissolved salts of $Ca^{2+}$ and $Mg^{2+}$

B

Undissolved $CaCO_3$

C

Undissolved salts of $Ca^{2+}$ and $Mg^{2+}$

D

Dissolved sulfates of Potassium

ChemistryEasyHardness Of Water

35.

Hard water is unfit for use in boilers for generating steam because

A

Water decomposes into $O_2$ and $H_2$

B

It produces scales inside the boiler

C

Its boiling point is high

D

Hard water does not produce lather inside boiler

ChemistryEasyHardness Of Water

36.

Hard water can be softened by passing it through

A

Ion – exchange resin

B

sodium silicate

C

Lime stone

D

sodium hexa meta phosphate

ChemistryEasyHardness Of Water

37.

Estimation of hardness of water by EDTA method is used to determine

A

Permanent hardness only

B

all the above

C

Alkaline hardness

D

temporary hardness only

ChemistryEasyHardness Of Water

38.

Disinfection by ozone is due to liberation of

A

Molecular Oxygen

B

oxide

C

Oxygen

D

nascent Oxygen

ChemistryEasyHardness Of Water

39.

Caustic embrittlement is a type of

A

scale formation

B

sludge formation.

C

Boiler corrosion

D

conditioning

ChemistryEasyHardness Of Water

40.

Caustic embrittlement can be avoided by using

A

ammonium hydroxide

B

sodium sulphate

C

Sodium phosphate

D

hydrogen

Hardness Of Water in Chemistry : Practice MCQ Questions & Answers with Explanations