Subject :NSO Class : Class 8
Which of the following statements are true?
(i) Cigarette smoke is a source of carbon monoxide.
(ii) Smog is a combination of smoke and fog which
mainly contains CFCs.
(iii) Burning of coal releases fly ash.
(iv) Acid rain increases the pH of rivers and lakes.
A (i) and (ii)
B (i) and (iii)
C (ii) and (iv)
D (iii) and (iv)
Ans 1:
Class : Class 8
Carbon monoxide and hydrogen cyanide are another 2 highly toxic chemicals found in cigarette smoke.Fly Ash, a very fine, powdery material composed mostly of silica made from the burning of finely ground coal in a boiler.