BITSAT Chemistry Environmental Chemistry MCQs

Question: Which of the following is not involved in the formation of photochemical smog?

a) Hydrocarbon 

b) NO

c) SO₂

d) O₃

Answer: SO₂

Question: Which of the following pollutants is main product of automobiles exhaust?

a) C O

b) CO₂

c) NO

d) Hydrocarbons

Answer: NO

Question: The disease caused the high concentration of hydrocarbon pollutants in atmosphere is/are

a) Silicosis

b) TB

c) Cancer

d) Asthma

Answer: Cancer

Question: Identify the wrong statement in the following:

a) Chlorofluorocarbons are responsible for ozone layer depletion

b) Greenhouse effect is responsible for global warming

c) Acid rain is mostly because of oxides of nitrogen and sulphur

d) Ozone layer does not permit infrared radiation from the sun to reach the earth

Answer: Ozone layer does not permit infrared radiation from the sun to reach the earth

Question: When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

a) Slightly lower than that of rain water without thunderstorm

b) Slightly higher than that when the thunderstorm is not there

c) Uninfluenced by occurrence of thunderstorm

d) Which depends upon the amount of dust in air

Answer: Slightly lower than that of rain water without thunderstorm

Question: The greenhouse effect is because of the

a) Presence of gases, which in general are strong infrared absorbers, in the atmosphere

b) Presence of CO₂ only in the atmosphere

c) Presence of O₃ and CH₄ in the atmosphere

d) N₂O and chlorofluorohydrocarbons in the atmosphere

Answer: Presence of gases, which in general are strong infrared absorbers, in the atmosphere

Question: Formation of ozone in the upper atmosphere from oxygen takes place by the action of

a) Nitrogen oxides

b) Ultraviolet rays

c) Cosmic rays

d) Free radicals

Answer: Ultraviolet rays

Question: Which is the major air pollutant

a) He

b) O₂

c) CO₂

d) CO

Answer: CO

Question: Which one of the following statements about ozone and ozone layer is true

a) Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sun

b) The conversion of ozone to oxygen is an endothermic reaction

c) Ozone has a triatomic linear molecule

d) None of the above

Answer: Ozone layer is beneficial to us because ozone cuts out the ultraviolet radiation of the sun

Question: Which of the following statements about polar stratosphere clouds (PSCs) is not correct?

a) PSCs do not react with chlorine nitrate and HCl

b) Type I clouds are formed at about –77ºC and contain solid HNO₃ . 3H₂O

c) Type II clouds are formed at about –85ºC and contain some ice

d) A tight whirlpool of wind called Polar Vortex is formed which surrounds Antarctica

Answer: PSCs do not react with chlorine nitrate and HCl  

Question: Minamata disease is due to pollution of

a) Aresenic into the atmosphere

b) Organic waste into drinking water

c) Oil spill in water

d) Industrial waste mercury into fishing water

Answer: Industrial waste mercury into fishing water

Question: Phosphate pollution is caused by

a) Sewage and agricultural fertilizers

b) Weathering of phosphate rocks only

c) Agriculutral fertilizers only

d) Phosphate rocks and sewage

Answer: Sewage and agricultural fertilizers

Question: Eutrophication causes reduction in

a) Dissolved oxygen

b) Nutrients

c) Dissolved salts

d) All the above

Answer: Dissolved oxygen

Question: The statement which is not correct about control of particulate pollution

a) In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed

b) Gravity settling chamber removes larger particles from the air

c) Cyclone collector removes fine particls in the diameter range 5-20 microns

d) Wet scrubbers are used to wash away all types of particulates

Answer: In electrostatic precipitator, the particulates are made to acquire positive charge which are then attracted by the negative electrode and removed

Question: Chief source of soil and water pollution is

a) Mining

b) Agro industry

c) Thermal power plant

d) All the above

Answer: All the above

Question: The false statement among the followings :

a) The average residence time of NO is one month

b) Limestone acts as a sink for SO_x

c) SO_x can be removed from flue gases by passing through a solution of citrate ions

d) Ammonia acts as a sink for NO_x

Answer: The average residence time of NO is one month

Question: Which of the following acts as a sink for CO?

a) Plants

b) Haemoglobin

c) Microorganisms present in the soil

d) Oceans

Answer: Microorganisms present in the soil

Question: Sewage mostly constitutes

a) Non-biodegradable pollutants

b) Biodegradable pollutants

c) Effluents

d) Air pollutants

Answer: Effluents

Question: BOD is connected with

a) Microbes and organic matter

b) Organic matter

c) Microbes

d) None of the above

Answer: Microbes and organic matter

Question: The type of pollution caused by spraying of DDT

a) Air and soil

b) Air and water

c) Air

d) Air, water and soil

Answer: Air, water and soil

Question: Presence of which fuel gas in the exhaust fumes shows incomplete combustion of fuel.

a) Sulphur dioxide

b) Carbon monoxide and water vapour

c) Carbon monoxide

d) Nitrogen dioxide

Answer: Carbon monoxide

Question: The substance having the largest concentration in acid rain?

a) H₂CO₃

b) HNO₃

c) HCl

d) H₂SO₄

Answer: H₂SO₄

Question: The greatest affinity for haemoglobin is shown by which of the following :

a) NO 

b) CO

c) O₂

d) CO₂

Answer: CO

Question: Which of the following is not a consequence of greenhouse effect?

a) Climatic conditions will be changed resulting in

b) Plants in warmer climates with adequate rainfall would grow faster

c) The incidence of infectious diseases is likely to increase

d) Malaria will be controlled as the mosquitoes will not survive.

Answer: Malaria will be controlled as the mosquitoes will not survive.

Question: The substance which is not regarded as a pollutant?

a) NO₂

b) CO₂

c) O₃

d) Hydrocarbons

Answer: CO₂