Learn Environmental Chemistry MCQ questions & answers in Inorganic Chemistry are available for students perparing for IIT-JEE, NEET, Engineering and Medical Enternace exam.
111.
Which of the following gases is not responsible for photochemical smog?
A
Oxides of nitrogen
B
Hydrocarbons
C
Inert gases
D
Carbon monoxide
Answer :
Inert gases
Hydrocarbons, oxides of nitrogen and carbon monoxide are responsible for photochemical smog.
112.
The secondary precursors of photochemical smog are
A
$$S{O_2}\,\,{\text{and}}\,\,N{O_2}$$
B
$$N{O_2}{\text{ and hydrocarbons}}$$
C
$${O_3}\,\,{\text{and}}\,\,PAN$$
D
$$C{O_2}\,\,{\text{and}}\,\,{O_2}$$
Answer :
$${O_3}\,\,{\text{and}}\,\,PAN$$
The primary precursors of photochemical smog are $$N{O_2}$$ and hydrocarbons and the secondary precursors are ozone and $$PAN.$$
113.
Ozone is an important constituent of stratosphere because it
A
destroys bacteria which are harmful to human life.
B
prevents the formation of smog over large cities.
C
removes poisonous gases of the atmosphere by reacting with them.
D
absorbs ultraviolet radiation which is harmful to human life.
Answer :
absorbs ultraviolet radiation which is harmful to human life.
Ozone absorbs $$U.V.$$ radiations harmful to human life.
114.
Which of the following is/are formed when ozone reacts with the unburnt hydrocarbons in polluted air?
(i) Formaldehyde
(ii) Acrolein
(iii) Peroxyacetyl nitrate
(iv) Formic acid
115.
Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen because ___________.
A
the reaction is endothermic and requires very high temperature
B
the reaction can be initiated only in presence of a catalyst
C
oxides of nitrogen are unstable
D
$${N_2}$$ and $${O_2}$$ are unreactive
Answer :
the reaction is endothermic and requires very high temperature
Dinitrogen and dioxygen do not react with each other at a normal temperature. At high temperature ( in an automobile engine ) when fossil fuel is burnt, these gases combine to yield Significant quantities of $$NO$$ and $$N{O_2}.$$
116.
The statement which is not true
A
$$N{O_2}$$ does not play any role in photochemical smog
B
$$S{O_3}$$ is more harmful air polluntant than $$S{O_2}$$
C
$$S{O_2}$$ dos not affect larynx ( voice box )
D
$$NO$$ is more toxic to living tissues than $$N{O_2}$$
Answer :
$$S{O_3}$$ is more harmful air polluntant than $$S{O_2}$$
$$S{O_3}$$ is more harmful pollutant than $$S{O_2}.$$
117.
Few pollutants and their effects are listed below. Mark the incorrect match.
A
Phosphate fertilizers in water - Eutrophication
B
Hydrogen released in air - Global warming
C
Sewage disposed in water - Increase in $$BOD$$ level
D
Sulphur dioxide in air - Acid rain
Answer :
Hydrogen released in air - Global warming
$${H_2}$$ is not responsible for global warming.
118.
Identify the correct statements.
(i) Winter smog is reducing in nature due to presence of particulate carbon and $$S{O_2}.$$
(ii) The pollutant obtained from emission tubes of diesel engines is benzopyrene.
(iii) Photochemical smog is made up of $$PAN,{O_3}$$ and oxides of nitrogen.
(iv) $$CFCs$$ are stable in troposphere and act as pollutants in stratosphere.
A
(ii), (iii) and (iv)
B
(i), (iii) and (iv)
C
(i), (ii) and (iii)
D
all of these
Answer :
all of these
No explanation is given for this question. Let's discuss the answer together.
119.
Use of which of the following solvent in dry cleaning will result in less harm to ground water ?
A
$$C{l_2}C = CC{l_2}$$
B
$${\text{Liquid}}\,C{O_2}$$
C
$${H_2}{O_2}$$
D
$${\text{None of these}}$$
Answer :
$${\text{Liquid}}\,C{O_2}$$
Replacement of earlier used tetra-chloroethene as solvent for dry cleaning by liquid $$C{O_2}$$ results in less harm to ground water.
120.
Which of the following gases is not a greenhouse gas?
A
$$CO$$
B
$${O_3}$$
C
$$C{H_4}$$
D
$${H_2}O\,\,{\text{vapour}}$$
Answer :
$$CO$$
Carbon dioxide, methane, water vapour, nitrous oxide, $$CFCs$$ and ozone are greenhouse gases. Carbon monoxide, $$CO$$ is not a greenhouse gas.