Learn Environmental Chemistry MCQ questions & answers in Inorganic Chemistry are available for students perparing for IIT-JEE, NEET, Engineering and Medical Enternace exam.
31.
Phosphate fertilizers when added to water leads to
A
increased growth of decomposers.
B
reduced algal growth.
C
increased algal growth.
D
nutrient enrichment (eutrophication).
Answer :
nutrient enrichment (eutrophication).
Addition of phosphate fertilizers to water leads to nutrient enrichment ( eutrophication )
32.
Which of the following is not a common component of photochemical smog?
A
Peroxyacetyl nitrate
B
Acrolein
C
Formaldehyde
D
Carbon dioxide
Answer :
Carbon dioxide
No explanation is given for this question. Let's discuss the answer together.
33.
Which one of the following statements is not correct?
A
$$DDT$$ and $$BHC$$ are not good insecticides because they are highly soluble in water.
B
$$DDT$$ and $$BHC$$ are not good insecticides because they are absorbed by the soil and contaminate root crops.
C
Aldrin is not a good insecticide because it is not biodegradable.
D
Organophosphates and carbamates are biodegradable insecticides, but these are severe nerve toxins.
Answer :
$$DDT$$ and $$BHC$$ are not good insecticides because they are highly soluble in water.
No explanation is given for this question. Let's discuss the answer together.
34.
Which of the following can control the photochemical smog?
(i) Use of catalytic converters in automobiles.
(ii) Plantation of trees like pinus, pyrus vitis etc.
(iii) Using less sulphur containing fossil fuels.
A
(i) and (iii)
B
(ii)
C
(i) and (ii)
D
(i), (ii) and (iii)
Answer :
(i) and (ii)
Usually catalytic converters are used in the automobiles, which prevent the release of nitrogen oxide and hydrocarbons to the atmosphere. Certain plants e.g., Pinus, Juniparus. Quercus, Pyrus and Vitis can metabolise nitrogen oxide and therefore, their plantation could help in this matter.
35.
Which of the following statement is false ?
A
London smog is oxidising in nature
B
Photochemical smog causes irritation in eyes
C
London smog is a mixture of smoke and fog
D
Photochemical smog results in the formation of $$PAN$$
Answer :
London smog is oxidising in nature
London smog is reducing in nature.
36.
The smog is essentially caused by the presence of
A
$${\text{oxides of sulphur and nitrogen}}$$
B
$${O_2}\,{\text{and}}\,{N_2}$$
C
$${O_2}\,{\text{and}}\,{O_3}$$
D
$${O_3}\,{\text{and}}\,{N_2}$$
Answer :
$${\text{oxides of sulphur and nitrogen}}$$
Smog is caused by oxides of sulphur and nitrogen.
37.
Green chemistry involves
A
production of chemicals of our daily use from green house gases
B
such chemical processes in which green plants are used
C
those reactions which are of biological origin
D
use of non-toxic reagents and solvents to produce environment friendly products
Answer :
use of non-toxic reagents and solvents to produce environment friendly products
By Green chemistry, we mean producing the chemicals of our daily needs using such reactions and chemical processes which neither use toxic chemicals nor emit such chemicals into the atmosphere.
38.
In Antarctica, ozone depletion is due to the formation of which of the following compounds?
A
Acrolein
B
$$PAN$$
C
$$PCBs$$
D
Chlorine nitrate
Answer :
Chlorine nitrate
\[Cl\overset{\centerdot \,\,\,\,}{\mathop{{{O}_{\left( g \right)}}}}\,+N{{O}_{2\left( g \right)}}\to \underset{\text{Chlorine nitrate}}{\mathop{ClON{{O}_{2\left( g \right)}}}}\,\]
39.
Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal ?
A
$${O_3}\,\,{\text{and}}\,\,C{O_2}$$
B
$$C{O_2}\,\,{\text{and}}\,\,N{O_2}$$
C
$$S{O_2}\,\,{\text{and}}\,\,N{O_2}$$
D
$$S{O_2}\,\,{\text{and}}\,\,{O_3}$$
Answer :
$$S{O_2}\,\,{\text{and}}\,\,N{O_2}$$
$$S{O_2}$$ and $$N{O_2}$$ are responsible for the discoloured and lustureless nature of marble.
40.
Biochemical Oxygen Demand, $$\left( {BOD} \right)$$ is a measure of organic material present in water. $$BOD$$ value less than $$5\,ppm$$ indicates a water sample to be ________.
A
rich in dissolved oxygen
B
poor in dissolved oxygen
C
highly polluted
D
not suitable for aquatic life
Answer :
rich in dissolved oxygen
Clean water rich in dissolved oxygen would have $$BOD$$ value of less than $$5\,ppm$$ whereas highly polluted water could have a $$BOD$$ value of $$17\,ppm$$ or more.