Which of these gases does not cause acid rain

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A Helium
B Nitrogen dioxide
C Nitrogen trioxide
D Sulphur trioxide

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Answer: A. Helium

Acid rain forms when gases like sulphur oxides and nitrogen oxides dissolve in rain water and make acids. Helium is an unreactive noble gas, so it does not form any acid and cannot cause acid rain.

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Which of these gases does not cause acid rain

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