ENVIRONMENTAL CHEMISTRY JEE

Which of the following conditions in drinking water causes methemoglobinemia?

(a) > 50 ppm of chloride

(b) > 50 ppm of nitrate

(c) > 50 ppm of lead

(d) > 100 ppm of sulphate

• a

• b

• c

• d

The smog is essentially caused by the presence of

(a) O₂ and O₃

(b) O₂ and N₂

(c) oxides of sulphur and nitrogen

(d) O₃ and N₂.

• a

• b

• c

• d

Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?

(a) Sulphur dioxide

(b) Carbon dioxide

(c) Nitrogen dioxide

(d) Tetrachloroethylene

• a

• b

• c

• d

Identify the wrong statement in the following.

(a) Acid rain is mostly because of the oxides of nitrogen and sulphur.

(b) Chlorofluorocarbons are responsible for ozone layer depletion.

(c) Greenhouse effect is responsible for global warming.

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

• a

• b

• c

• d

The upper stratosphere consisting of the ozone layer protects us from the sun’s radiation that falls in the wavelength region of

(a) 400-550 nm

(b) 600-750 nm

(c) 200-315 nm

(d) 0.8-1.5 nm

• a

• b

• c

• d

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to

(a) acid rain

(b) soil pollution

(c) water pollution

(d) global warming

• a

• b

• c

• d

The maximum prescribed concentration of copper in drinking water is

(a) 0.05 ppm

(b) 3 ppm

(c) 5 ppm

(d) 0.5 ppm

• a

• b

• c

• d

The gas leaked from a storage tank of the Union Carbide plant in Bhopal gas tragedy was

(a) phosgene

(b) methylisocyanate

(c) methylamine

(d) ammonia.

• a

• b

• c

• d

Air pollution that occurs in sunlight is

(a) oxidising smog

(b) fog

(c) reducing smog

(d) acid rain.

• a

• b

• c

• d

The higher concentration of which gas in air can cause stiffness of flower buds?

(a) SO₂

(b) CO

(c) NO₂

(d) CO₂

• a

• b

• c

• d