Page 213 - Chemistry ICSE Class IX

Atmospheric Pollution 201
(xv) The gases which cause acid rain are
(a) CO , CO ˆ (b) SO , SO , and NO ˆ
2
2
2
3
(c) H S, NH ˆ (d) CO , H O and CH ˆ
2
3
4
2
2
(xvi) Scrubbers are used in the industry to remove
(a) oxygen gas ˆ (b) oxides of sulphur ˆ
(c) oxides of nitrogen ˆ (d) nitrogen gas ˆ
(xvii) Which of the following is a greenhouse gas?
(a) methane ˆ (b) nitrogen ˆ
(c) carbon monoxide ˆ (d) hydrogen sulphide ˆ
(xviii) Which of the following helps in maintaining temperature of the earth at moderate level?
(a) carbon monoxide ˆ (b) water vapour ˆ
(c) carbon dioxide ˆ (d) oxygen ˆ
(xix) The chemical responsible for the destruction of ozone is
(a) hydro uorocarbons ˆ (b) methane ˆ
(c) compressed natural gas ˆ (d) chloro uorohydrocarbons ˆ

Answers

(i) (d) (ii) (c) (iii) (d) (iv) (a) (v) (b) (vi) (c)
(vii) (a) (viii) (c) (ix) (b) (x) (a) (xi) (b) (xii) (d)
(xiii) (a) (xiv) (c) (xv) (b) (xvi) (b) (xvii) (a) (xviii) (c)
(xix) (d)