NTA NEET Environmental Chemistry model,Grand,mock,online practice tests

Environmental Chemistry Mock Test-5

Question No:1

Wllich of the following is NOT involved in the formation of photochemical smog?

[A] Hydrocarbon
[B] NO
[C] SO2
[D] O3



Question No:2

In the lower atmosphere, ozone is formed by the reaction between

[A] O2 and CFCs
[B] NO2 and O2
[C] O2 and NO
[D] All of these.



Question No:3

Tropospheric pollution is mainly due to

[A] gaseous air pollutants
[B] participate pollutants
[C] Roth (a) and (b)
[D] None of these



Question No:4

Wllich of die following reaction will deplete O, layer?

[A] HOCl \( \xrightarrow{UV} \) OH+Cl
[B] \( \xrightarrow{UV} \) 2Cl
[C] \( \xrightarrow{UV} \) CF23+Cl
[D] All of these.



Question No:5

In stratosphere CPCs gets broken down by the action of (powerful UV radiations releasing

[A] CH3
[B] ClO
[C] Cl
[D] CFCl2



Question No:6

‘Good ozone’ is found in

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



Question No:7

Which among the following are added to petrol to Improve antiknock quality of fuel?

[A] Tetraethyl lead
[B] Tetra methyl lead
[C] both (a) and (b)
[D] None of these.



Question No:8

Assertion (A): The pH of acid rain to km than 5.6 Reason (R): carbon dioxide present in the atmosphere dissolves in rainwater and forms carbonic acid.

[A] Both A and R are true and R is the correct explanation ol A.
[B] Both A and R are true but R is not the correct explanation of A.
[C] A Is true but R is false.
[D] Both A and R are false.



Question No:9

Assertion (A): Plunochemlcal smog Is oxidising in luuue.
Reason (R): Photochemical smog contains NO2 and Ov which are formed during the sequence of reactions.

[A] Both A and R are true and R is the correct explanation of A.
[B] Both A and R are true but R is not the correct explanation of A
[C] A is true but R is false
[D] Both A and R are false.



Question No:10

Assertion (A): CO2 is one of the Important greenhouse gases.
Reason (R): It us largely produced by the respiratory function of animals and plants.

[A] Both A and R are true and R is the correct explanation of A.
[B] Both A and R are true but R is not the correct explanation of A
[C] A is true but R is false
[D] Both A and R are false.



Question No:11

Assertion (A): Ozone is destroyed by solar radiation in upper stratosphere.
Reason (R): Thinning ot ozone layer allows excessive UV radiations to reach the surface of earth.

[A] Both A and R are true and R is the correct explanation of A.
[B] Both A and R are true but R is not the correct explanation of A
[C] A is true but R is false
[D] Both A and R are false.



Question No:12

Assertions (A): Global warming is due to CO2
Reason (R): Green plants require O2 and in turn they emit CO2 In photosynthesis.

[A] Both A and R are true and R is the correct explanation of A.
[B] Both A and R are true but R is not the correct explanation of A
[C] A is true but R is false
[D] Both A and R are false.



Question No:13

Assertion (A): Dmitrogen and dtoxvgen do not react with each oilier at normal temperature. Reason (R): At high altitude, dinitrogen combines with dioxide to form oxide of nitrogen.

[A] Both A and R are true and R is the correct explanation of A.
[B] Both A and R are true but R is not the correct explanation of A
[C] A is true but R is false
[D] Both A and R are false.



Question No:14

Assertion (A): Acid rain is harmful for agriculture trees and plants.
Reason (R): Acid rain dissolves and washes a way nutrients needed for the growth ot agriculture trees and plants.

[A] Both A and R are true and R is the correct explanation of A.
[B] Both A and R are true but R is not the correct explanation of A
[C] A is true but R is false
[D] Both A and R are false



Question No:15

Which one of the lo following .statements is not Correct?

[A] Clean water would have a BOD value ot 5 ppm.
[B] Fluoride deficiency In drinking water Is harmful. Soluble fluoride is often used to bring Its concentration up to 1 ppm.
[C] When the pH value of rainwater is higher than 6.5, it Is called acid rain.
[D] Dissolved oxygen (DO) in cold water can reach a concentration up to 10 ppm.