12 Which of the following is not found in the atmosphere?

oxygen

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hydrogen

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nitrogen

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carbon dioxide

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Solution

The correct option is B
hydrogen

The explanation for the correct option:
(B)-Hydrogen
The earth is covered by a huge blanket of air known as the atmosphere.
Air is made up of a mixture of various gases. Out of them, the percentage of hydrogen is almost negligible.
The explanation for incorrect options:
(A)-Oxygen
Air is composed of 21% of Oxygen.
This gas is used in the respiration process.
(C)-Nitrogen
Air is composed of 78% of Nitrogen.
Nitrogen is also a major component of amino acids, the building blocks of proteins.
(D)-Carbon dioxide
Air is composed of 1% of Carbon dioxide
This gas is utilized by plants in the photosynthesis process to make their food.
$begin mathsize 14px style stack 6 C O subscript 2 open parentheses g close parentheses with Carbon space Dioxide below plus space stack 6 H subscript 2 O with Water below open parentheses l close parentheses yields with Chlorophyll below and sunlight on top stack C subscript 6 H subscript 12 O subscript 6 with Glucose below open parentheses aq close parentheses plus stack 6 O subscript 2 with Oxygen below open parentheses g close parentheses end style$
Final answer: A correct answer is an option (B)

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