Multiple choice

Which of the following combine to form smog? (i) Smoke (ii) CFCs (iii) Fog (iv) Dust

  1. (i) and (ii)

  2. (i) and (iii)

  3. (i) and (iv)

  4. (iii) and (iv)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

 Smog is formed in cold weather by combination of smoke and fog.

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