Environmental Chemistry MCQs

Environmental Chemistry is the study of the chemical and biochemical reactions that occur in our surroundings. It focuses on the chemical species present in the environment, their origins, fates, transport, reactions, effects, and the impact of human activities. This field involves examining the chemical components of water, soil, and air, drawing on other branches such as analytical chemistry, soil chemistry, aquatic chemistry, atmospheric chemistry, and biochemistry.

The reaction responsible for the radiant energy of the Sun is

(a) nuclear fission
(b) nuclear fusion
(c) chemical reaction
(d) combustion

Photochemical smog normally does not contain

(a) Chlorofluorocarbons
(b) Peroxyacetyl nitrate
(c) Ozone
(d) Acrolein

The compound essential for the process of photosynthesis has this element

(a) Ca
(b) Ba
(c) Fe
(d) Mg

Alum’s capacity to purify water is due to

(a) softens hard water
(b) pathogenic bacteria get destroyed
(c) impurities’ coagulation
(d) it improves taste

Depletion of the ozone layer is caused due to

(a) Ferrocene
(b) Fullerenes
(c) Freons
(d) Polyhalogens

The coldest region of the atmosphere

(a) Troposphere
(b) Thermosphere
(c) Stratosphere
(d) Mesosphere

In the air, N2 and O2 occur naturally but they do not react to form oxides of nitrogen because

(a) oxides of nitrogen are unstable
(b) catalyst is required for the reaction
(c) the reaction is endothermic
(d) N2 and O2 do not react with each other

Which of the oxide of nitrogen is not a common pollutant?

(a) N2O5
(b) N2O
(c) NO
(d) NO2

Find the incorrect statement

(a) BOD value of clean water is less than 5 ppm
(b) Drinking water pH should be between 5.5-9.5
(c) carbon, sulphur and nitrogen oxides are the most widespread air pollutants
(d) dissolved oxygen concentration below 5 ppm is ideal for the growth of fish

Find the secondary pollutant among these

(a) PAN
(b) N2O
(c) SO2
(d) CO2