Multiple choice

Consider the following statements about the components of air: a. Nitrogen helps in diluting the effect of oxygen. b. Oxygen does not support combustion and burning. c. Noble gases are present in trace quantities in air. d. Water vapours are always presents in large quantities in air.

Which of the given statements about components of air are correct?

  1. a and b

  2. b and c

  3. a and c

  4. b and d
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The main gas present in the air is nitrogen (78.1% by volume) and it helps in diluting the effect of oxygen. The noble gases present in the air are helium, neon, argon, krypton and xenon. Since the percentage of these gases is very small, so, these gases are also called "rare gases".

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