Environmental Chemistry

NEET Chemistry · 96 questions · Page 1 of 10 · Click an option or "Show Solution" to reveal answer

Which statement is not true about photochemical smog?

A Photochemical smog is harmful to humans but has no effect on plants.

B Plants like Pinus, Juniparus can help in reducing the photochemical smog.

C Photochemical smog occurs in warm, dry and sunny climate.

D Common components of Photochemical smog are ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate.

Correct Answer

Option A

Solution

Option A is not true about photochemical smog.

Explanation: Photochemical smog is harmful to both humans and plants.

It damages plant tissues and affects their growth.

Option A says: Photochemical smog is harmful to humans but has no effect on plants.

This is incorrect because it does affect plants.

Other options: Option B: Plants like Pinus, Juniparus can reduce photochemical smog — This is correct.

Option C: Photochemical smog occurs in warm, dry and sunny climate — This is correct.

Option D: Common components include ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate — This is correct.

Final Answer: Option A

Among the following, the one that is not a green house gas is :

A ozone

B sulphur dioxide

C nitrous oxide

D methane

Correct Answer

Option B

Solution

Sulphurdioxide (SO 2 ) is not a green house gas.

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

A N 2 O 5

B NO 2

C N 2 O

D NO

Correct Answer

Option A

Solution

N 2 O 5 is highest oxidation number oxide which will not easily formed by common or natural oxidation of lower oxides of nitrogen.

Which one of the following is not a common component of Photochemical smog?

A Ozone

B Acrolein

C Peroxyacetyl nitrate

D Chlorofluorocarbons

Correct Answer

Option D

Solution

CFC (Chlorofluoro carbons) is not the component of photochemical smog.

Which one of the following statements is not true?

A Clean water would have a BOD value of 5 ppm.

B Fluoride deficiency in drinking water is harmful. Soluble fluoride is often used to bring its concentration upto 1 ppm.

C When the pH of rain water is higher than 6.5, it is called acid rain.

D Dissolved Oxygen (DO) in cold water can reach a concentration upto 10 ppm.

Correct Answer

Option C

Solution

Acid rain is the rain water containing sulphuric acid and nitric acid which are formed from the oxides of sulphur and nitrogen present in the air as pollutants and rain water has a pH range of 4-5.

Which one of the following statements regarding photochemical smog is not correct?

A Carbon monoxide does not play any role in photochemical smog formation.

B Photochemical smog is an oxidation agent in character.

C Photochemical smof is formed through photochemical reaction involving solar energy.

D Photochemical smog does not cause irritation in eyes and throat.

Correct Answer

Option D

Solution

Photochemical smog cause eye and throat irritation.

Which one of the following statement is not true?

A pH of drinking water should be between 5.5

-

9.5

B Concentration of DO below 6 ppm is good for the growth of fish.

C Clean water would have a BOD value of less than 5 ppm.

D Oxides of sulphur, nitrogen and carbon are the most widespread air pollutant.

Correct Answer

Option B

Solution

Fish dies in water bodies polluted by sewage due to decrease in dissolved oxygen (DO).

Green chemistry means such reactions which

A are related to the depletion of ozone layer

B study the reactions in plants

C produce colour during reactions

D reduce the use and production of hazardous chemicals.

Correct Answer

Option D

Solution

Green chemistry may be defined as the programme of developing new chemical products and chemical processes or making improvements in the already existing compounds and processes so as to make them less harmful to human health and environment.

This means the same as to reduce the use and production of hazardous chemicals.

Which of the following is a sink for CO?

A Microorganisms present in the soil

B Oceans

C Plants

D Haemoglobin

Correct Answer

Option A

Solution

Microorganisms present in the soil is a sink for CO.

Q10

The maximum prescribed concentration of copper in drinking water is :

A 3 ppm

B 5 ppm

C 0.5 ppm

D 0.05 ppm

Correct Answer

Option A

Solution

Maximum prescribed concentration of Cu in drinking water is 3 ppm.

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