Learn Environmental Chemistry MCQ questions & answers in Inorganic Chemistry are available for students perparing for IIT-JEE, NEET, Engineering and Medical Enternace exam.
11.
Minamata disease of Japan is due to pollution of
A
Aresenic
B
Lead
C
Cyanide
D
Mercury
Answer :
Mercury
Minamata is caused by $$Hg$$ poisoning.
12.
$$B.O.D.$$ values off our samples of water $$A, B, C$$ and $$D$$ are given below
(i) 160 $$ppm$$
(ii) 35 $$ppm$$
(iii) 180 $$ppm$$
(iv) 25 $$ppm$$
The decreasing order of extent of pollution in water is
A
(iii) > (i) > (iv) > (ii)
B
(iv) > (ii) > (i) > (iii)
C
(iii) > (i) > (ii) > (iv)
D
(iv) > (i) > (ii) > (iii)
Answer :
(iii) > (i) > (ii) > (iv)
Higher value of $$BOD$$ indicates more pollution.
13.
Identify the correct statement.
A
Non-conventional sources of energy cause more pollution.
B
Ozone is a harmless gas present in the atmosphere.
C
Chlorofluorocarbons break down to chlorine atoms by ultraviolet radiation.
D
Trees do not help in decreasing rate of global warming.
Answer :
Chlorofluorocarbons break down to chlorine atoms by ultraviolet radiation.
Chlorine atoms are released in the atmosphere by chlorofluorocarbons due to dissociation by $$UV$$ radiations.
14.
Which of the following statements are true?
(i) Ammonia acts as sink for $$N{O_x}.$$
(ii) Limestone acts as sink for $$S{O_x}.$$
(iii) The average residence time of $$NO$$ is one month.
(iv) $$S{O_x}$$ can be removed from flue gases by passing through a solution of citrate ions.
A
(i) and (ii)
B
(ii) and (iii)
C
(i), (ii) and (iv)
D
(i), (ii), (iii) and (iv)
Answer :
(i), (ii) and (iv)
The average residence time of $$NO$$ is 4 days.
15.
Carbon monoxide $$(CO)$$ is harmful to man because
A
it forms carbolic acid.
B
it generates excess $$C{O_2}.$$
C
it is carcinogenic.
D
it competes with $${O_2}$$ for haemoglobin.
Answer :
it competes with $${O_2}$$ for haemoglobin.
$$CO$$ is highly toxic and impairs respiration. $$CO$$ combines with haemoglobin of blood and reduces its $${O_2}$$ carrying capacity.
16.
Mists are produced by
A
smoke formed during combustion of organic matter
B
particles of spray liquids and by condensation of vapours in air
C
fine solid particles produced during crushing and grinding
D
condensation of vapours during chemical reactions
Answer :
particles of spray liquids and by condensation of vapours in air
Mists are produced by particles of spray liquids and by condensation of vapours in air. The insecticides and herbicides sprayed in the field travel through air and form mists.
17.
The greenhouse effect is because of the
A
presence of gases, which in general are strong infrared absorbers, in the atmosphere
B
presence of $$C{O_2}$$ only in the atmosphere
C
pressure of $${O_3}$$ and $$C{H_4}$$ in the atmosphere
D
$${N_2}O$$ and chlorofluorohydrocarbons in the atmosphere
Answer :
presence of gases, which in general are strong infrared absorbers, in the atmosphere
Green house gases such as $$C{O_2},$$ ozone, methane, the chlorofluorocarbon compounds and water vapour form a thick cover around the earth which prevents the IR rays emitted by the earth to escape. It gradually leads to increase in temperature of atmosphere.
18.
Carbon monoxide is naturally produced by oxidation of $$\underline {\,\,X\,\,} ,$$ a gas present in swamp area while it can be produced by $$\underline {\,\,Y\,\,} $$ of fuels containing carbon.
No explanation is given for this question. Let's discuss the answer together.
19.
Ozone hole is maximum over
A
Europe
B
Antarctica
C
India
D
Africa
Answer :
Antarctica
Although the depletion of ozone takes place in all parts of the stratosphere, yet the ozone hole has mainly observed in the stratosphere over Antarctica.
20.
Which of the following is/are the hazardous pollutant$$(s)$$ present in automobile exhaust gases?
$$\eqalign{
& {\text{(i)}}\,{N_2} \cr
& {\text{(ii)}}\,CO \cr
& {\text{(iii)}}\,C{H_4} \cr
& {\text{(iv)}}\,{\text{Oxides of nitrogen}} \cr} $$
A
(ii) and (iii)
B
(i) and (ii)
C
(ii) and (iv)
D
(i) and (iii)
Answer :
(ii) and (iv)
$$CO$$ and oxides of Nitrogen are poisnous gases present in automobile exhaust gases.