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ICSE Class 7 Chemistry Question 3 of 20

Air & Atmosphere — Question 6

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Question

Question 6

Of the total volume of air 4⁄5th is nitrogen. State the utility or consequence of this ratio.

Answer

The fact that 4⁄5th of the total volume of air is nitrogen is useful for the following reasons:

  1. Controlled Combustion — Nitrogen being a non-supporter of combustion, dilutes the activity of oxygen in air and controls the combustion of substances.
  2. Growth of Plants — Free nitrogen of air is converted into soluble nitrogen compounds which are absorbed by plants and contribute to their growth and development.
  3. Breathable Air — Nitrogen in the atmosphere dilutes the oxygen, making it safe for us to breathe. Without this dilution, pure oxygen could be harmful and even flammable.