Multiple choice

Hydrocarbons and nitrogen oxide combine in the presence of ultraviolet rays to form a harmful air pollutant. It is known as

  1. mist

  2. photochemical smog

  3. nitrogen dioxide

  4. peroxyacetyl nitrate
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Hydrocarbons and nitrogen oxide combine together in the presence of ultraviolet rays to form photochemical smog. It is a thick dark or yellow fog that causes toxic effect on man, animals and plants.

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