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Question

Smog is formed when fog is mixed with _______

A
Sulphur
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B
Mercury
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C
Smoke
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D
Snow flakes
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Solution

The correct option is C Smoke
Smog is formed when fog is mixed with smoke. The presence of unburnt hydrocarbons in air when mixed with condensed water vapour forms a thick layer called smog. It lowers the visibility during winters and is an indication of air pollution.

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