NCERT Class11 Chemistry Environmental Chemistry MCQs,PDFs,mock tests

Environmental Chemistry Mock Test-2

Question No:1

Photochemical smog occurs in warm dry and sunny climate. One of the following is not among die components of photochemical smog. Identity it.

[A] NO2
[B] O3
[C] SO2
[D] Unsaturated hydrocarbon



Question No:2

The main element of smog is

[A] O3 and PAN
[B] O3
[C] PAN
[D] PPN and PBN



Question No:3

The biggest partial late of matter is

[A] HNO3 droplets
[B] Soot
[C] H2SO4 droplets
[D] Fly ash



Question No:4

Which of the following statements is NOT true about classical smog?

[A] Its main components are produced by action of sunlight on emissions of automobiles and factories.
[B] Produced in cold and humid climate.
[C] It contains compounds of reducing nature.
[D] It contains smoke, fog and SO2.



Question No:5

Which of the following statements is wrong?

[A] Ozone is not responsible for greenhouse effect
[B] Ozone can oxidise sulphur dioxide present in atmosphere to SO3
[C] Ozone hole is thinning of ozone layer present in stratosphere.
[D] Ozone is produced in upper stratosphere by die action of UV rays on oxygen.



Question No:6

The gaseous envelope around the earth is known as atmosphere.The lowest layer of this is extended up to 10 km from sea level. This laver is

[A] Stratosphere
[B] Troposphere
[C] Mesosphere
[D] Hydrosphere



Question No:7

Which of the followirng statements about photochemical smog is wrong?

[A] It has high concentration of oxidising agents.
[B] It lias low concentration of oxidising agents.
[C] It can be controlled by controlling the release of NO2 hydrocarbons, ozone, etc.
[D] Plantation of some plants like Pirius helps in controlling the photochemical smog.



Question No:8

Dinitrogen and dioxygen are the main constituents of air but these do not react with each other to form oxides of nitrogen because

[A] the reaction is endothermic and require very high temperature
[B] the reaction can be initiated only in presence of catalyst.
[C] oxides of nitrogen are unstable.
[D] N2 and O2 are unreactive.



Question No:9

The pollutions that come directly in the air from sources are called primary pollutions. Primary pollutants are sometimes converted into secondary pollutants. Which of the following belongs to secondary pollutants?

[A] CO
[B] Hydrocarbon
[C] Peroxyacetyl nitrate
[D] NO



Question No:10

Which one of the following statements regarding photochemical smog is not correct?

[A] Carbon monoxide does not play any role in photochemical smog formation.
[B] Photochemical smog is an oxidising agent in character.
[C] Photochemical smog is formed through photochemical reaction involving solar energy.
[D] Photochemical smog does not cause irritation in eyes and throat



Question No:11

The uppermost region of the aunosphere is called

[A] Ionosphere
[B] Stratosphere
[C] Troposphere
[D] Exosphere



Question No:12

The region that is greatly afftected by air pollution is

[A] Thermosphere
[B] Stratosphere
[C] Troposphere
[D] Mesosphere



Question No:13

The quantity of CO2 in atmosphere is

[A] 3.34%
[B] 6.50%
[C] 0.03%
[D] 0.34%



Question No:14

The substance that is not regarded of a pollutant is

[A] NO2
[B] CO2
[C] O3
[D] Hydrocarbons



Question No:15

The gas responsible tor ozone depletion is

[A] NO and Freons
[B] SO2
[C] CO2
[D] CO