40. Which of the following gases is not present in the air?

Carbon dioxide

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Sulfur dioxide

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Oxygen

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Nitrogen

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Solution

The correct option is B
Sulfur dioxide

Explanation of correct option:
(B) Sulfur dioxide:
Air does not contain sulfur dioxide.
Sulfur dioxide is emitted into the atmosphere when humans burn fossil fuels.
Explanation of incorrect option:
(A) Carbon dioxide:
Air contains about 0.03% of carbon dioxide.
(C) Oxygen:
Air contains about 21% of oxygen.
(D) Nitrogen:
Air contains about 78% of nitrogen.
Conclusion: Hence, option (B) is correct.

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