Multiple choice

Which of the following statements is/are false? a. An unwanted and harmful substance that contaminates the environment is called a pollutant. b. The two main gases present in the air are oxygen and hydrogen. c. A substance becomes an air pollutant when it is present in the air in such concentrations which are high enough to have a harmful effect on the living and non-living things.

  1. Only a

  2. Only a and b

  3. Only b

  4. Only b and c

  5. Only c
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This is the correct option as this statement is false. The two main gases present in the air are oxygen and nitrogen, and not oxygen and hydrogen.

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