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Sulphur dioxide and nitrogen dioxide react with water vapour in air to form acids that fall as:

ADew drops
BHail stones
CAcid rain
DBlack smog
Answer & Solution
Correct answer: C. Acid rain
1. Sulphuric and nitric acids form. 2. They fall as acid rain. 3. Acid rain corrodes marble. _Source: syllabus Science, Chapter 18, Pollution of Air and Water._
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