Class 11 Chemistry Chapter 14 Environmental Chemistry

This set of Class 11 Chemistry Chapter 14 Multiple Choice Questions & Answers (MCQs) focuses on “Environmental Chemistry”. These MCQs are created based on the latest CBSE syllabus and the NCERT curriculum, offering valuable assistance for exam preparation.

1. A substance, which causes pollution, is known as which of the following?
a) Pollutant
b) Carcinogen
c) Polluting element
d) Irritant
View Answer

Answer: a
Explanation: A substance, causing pollution, is called as a pollutant. Pollutants can be solid, liquid, or gaseous substances present in greater concentrations than in natural abundance and are produced due to human activities or due to natural happenings. Carcinogens are substances, if exposed to, which can cause cancer. Irritants normally cause irritations to skin.

2. Identify the degradable pollutant from the following.
a) Chemicals
b) Metals
c) Discarded vegetables
d) Plastic
View Answer

Answer: c
Explanation: Discarded vegetables are degradable pollutants. Since they are organic, they can be rapidly broken down by micro-organisms through natural processes. Chemicals, metals, and plastics are inorganic and they will slowly degrade, thereby, remaining in an unchanged form in the environment for many decades.

3. What is the full form of DDT?
a) Diphenyldichlorotrichloroethane
b) Dichlorodiphenyltrichloroethane
c) Dichlorodiphenyltriphenylethane
d) Dichlorodiphenyltrichloroethene
View Answer

Answer: b

Explanation: The full form of DDT is dichlorodiphenyltrichloroethane. It is a colorless, tasteless, and almost odorless crystalline chemical compound. It was originally developed as an insecticide, but then, its use was stopped due to its harmful effect on environment as well as on the living organisms. If exposed to high concentrations, it can cause vomiting, seizures or tremors in human beings.

4. An average human being requires nearly 12-15 times more air than the food.
a) True
b) False
View Answer

Answer: a
Explanation: An average human being requires nearly 12-15 times more air than the food. So, even small amounts of pollutants in the air become significant compared to similar levels present in the food. Therefore, the amount of people suffering various diseases due to contaminants in air is more than that suffering due to contaminants in food.

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5. Which of the following is not a constituent of DDT?
a) Carbon
b) Fluorine
c) Chlorine
d) Hydrogen
View Answer

Answer: b
Explanation: Fluorine is not a constituent of DDT. DDT is dichlorodiphenyltrichloroethane which has a chemical formula of C₁₄H₉Cl₅. Therefore, DDT does not contain fluorine, which is evident from the chemical formula. It also contains impurities in small quantities, i.e., about 15% of its composition. The major component which comprises of 77% of the substance is its para isomer.

More MCQs on Class 11 Chemistry Chapter 14:

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