Page 212 - Chemistry ICSE Class IX

200 ICSE Chemistry – 9
19. Tick (9) the correct answer.

(i) Tropospheric pollution is also called
(a) radiation pollution ˆ (b) soil pollution ˆ
(c) thermal pollution ˆ (d) air pollution ˆ

(ii) The region of the atmosphere nearest to the earth is
(a) stratosphere ˆ (b) mesosphere ˆ
(c) troposphere ˆ (d) thermosphere ˆ
(iii) The gas of vital importance to all living organisms present in the stratosphere is
(a) oxygen ˆ (b) carbon dioxide ˆ
(c) nitrogen ˆ (d) ozone ˆ
(iv) The gas that contributes most to the greenhouse effect is
(a) carbon dioxide ˆ (b) water vapour ˆ
(c) methane ˆ (d) ozone ˆ
(v) Which of the following is a gaseous pollutant?
(a) fumes ˆ (b) sulphur dioxide ˆ
(c) mist ˆ (d) smoke ˆ
(vi) Depletion of ozone in the atmosphere may cause
(a) rise in the temperature on the earth ˆ (b) fall in temperature on the earth ˆ
(c) skin cancer ˆ (d) blood cancer ˆ
(vii) Which of the following is a primary pollutant?
(a) CO ˆ (b) H SO ˆ
4
2
(c) peroxyacetyl nitrate ˆ (d) HNO ˆ
3
(viii) Which particulate causes a disease called silicosis?
(a) asbestos ˆ (b) cement dust ˆ
(c) silica ˆ (d) mist ˆ
(ix) The particulate that leads to stippled red blood cells is
(a) iron ˆ (b) lead ˆ
(c) mercury ˆ (d) chromium ˆ
(x) Ozone in the stratosphere is destroyed by

(a) Cl ˆ (b) OH ˆ

(c) H ˆ (d) ClO ˆ
(xi) The gas which combines with haemoglobin to affect the transport of oxygen gas in our body is
(a) carbon dioxide ˆ (b) carbon monoxide ˆ
(c) ozone ˆ (d) nitrogen ˆ
(xii) The catalyst used in the catalytic converter in automobiles is based on
(a) silver ˆ (b) palladium ˆ
(c) copper ˆ (d) platinum ˆ
(xiii) Peroxyacetyl nitrate is responsible for
(a) chemical smog ˆ (b) mist ˆ
(c) photochemical smog ˆ (d) fog ˆ
(xiv) All the forms of precipitation collectively called acid rain has pH
(a) below 2 ˆ (b) above 7 ˆ
(c) between 2 and 5 ˆ (d) between 5.6 and 7 ˆ