Chemistry Practice MCQs Chapter 16 Class 12

Chemistry Ch 16 Class 12

1 / 18

Measuring ‘Biochemical Oxygen Demand’ (ROD) is a method used for:

Estimating the amount of organic matter in sewage water for determining quality

Measuring the activity of Saccharomyces cerevisiae in producing curd on a commercial scale.

Working out the efficiency of RBCs, about their capacity to carry oxygen.

Working out the efficiency of oil driven automobile engines.

2 / 18

Which of the following is a water cleaning halogen?

CI

Br

F

I

3 / 18

Which one substance is used to remove both H2S and carbon dioxide from biogas?

Sodium oxide

Calcium oxide

Both a and b

None of the above

4 / 18

Which of the following is a secondary pollutant?

CO2

Sulphur Oxide

Nitrogen Oxide

O3

5 / 18

Ozone Is

02

03

04

ps

6 / 18

Earth’s crust Is Included In which sphere?

Lithosphere

Hydrosphere

Atmosphere

Aerosphere

7 / 18

Which one is correct about Incineration of Industrial waste?

Ash buried in sea water.

Secondary chamber is maintained at temperature range 650 C to 1100 C

Smoke stacks emit oxides of nitrogen and carbo

Solids wastes are the significant sources of dioxins

8 / 18

Which of the following gases has least concentration in air a

02

H2

He

CO2

9 / 18

Ozone absorbs

UV

Radioactive radiations

IR

All of these

10 / 18

Which one of these Is toxic?

Nitrous oxide

Nitric oxide

Sulphur dioxide

Carbon dioxide

11 / 18

Treatment of water which is very effective in killing of pathogens is:

Aeration

Coagulation

Landfill

Chlorine usage

12 / 18

NO2 in atmosphere absorbs moisture to form?

HNO3

HNO2

NO

Both a and b

13 / 18

Function of ozone Is?

To filter UV radiations

Act as a reducing agent

Act as an antibiotic

None of these

14 / 18

Global scale SO2 is produced by

Combustion

Fossil fuels

Volcano

None of these

15 / 18

What is the major reason for S02 emissions?

Agriculture

Volcanic eruptions

Fuel combustion

All of the above

16 / 18

Which of the following causes suffocation?

S02

CO2

Fog

All of these

17 / 18

The best yield of 502 can be obtained by which of the following:

Burning of coal

Excess of oxygen

Fertilization

Oxides of pyrites

18 / 18

Chloro-fluoro carbons cause

Radiations pollution

Water pollution

Air pollution

Soil pollution

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Chemistry Practice MCQs Chapter 16 Class 12

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Chemistry Practice MCQs Chapter 16 Class 12

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