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Question

Circle the odd one out. Give a reason for your choice.


A

Hydrogen

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B

Nitrogen

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C

Oxygen

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D

Carbon dioxide

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Solution

The correct option is A

Hydrogen


The explanation for the correct option -

Option (A) Hydrogen

  • Air is made up of a mixture of gases.
  • The main constituents of gases are nitrogen, oxygen, carbon dioxide, noble gases, water vapour, and dust particles.
  • Hydrogen is not present in the composition of the air that is present around us.

The explanation for the incorrect option -

Option (B) Nitrogen - It is present by 78% by volume in the atmosphere.

Option (C) Oxygen - It is present by 21% by volume in the atmosphere.

Option (D) Carbon dioxide - It is present by 0.03% by volume in the atmosphere.

Nitrogen, oxygen, and carbon dioxide are the constituents of air that are present around us.

Therefore, Option (A) Hydrogen is the correct answer.


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