Page 219 - Chemistry ICSE Class X
P. 219
Metallurgy 205
(c) silver
(d) aluminium
(iv) “is malleable and ......“ This statement best describes
(a) a metal
(b) a nonmetal
(c) a metalloid
(d) a compound
(v) The most reactive metal of the following is
(a) zinc
(b) iron
(c) magnesium
(d) sodium
(vi) The reaction, Na O + H SO o Na SO + H O indicates the following nature of sodium oxide:
2
4
2
4
2
2
(a) acidic
(b) basic
(c) amphoteric
(d) neutral
(vii) Bauxite is an ore of
(a) iron
(b) aluminium
(c) calcium
(d) zinc
(viii) The process by which a metal is extracted from its ore is called
(a) metallurgy
(b) smelting
(c) calcination
(d) roasting
(ix) The impurities present in an ore are known by the name
C ƀWZ
(b) ore
(c) gangue
(d) slag
(x) The process of heating an ore in the presence of excess of air, below its melting point, is called
(a) roasting
(b) calcination
(c) smelting
(d) sublimation
(xi) The process of heating an ore in limited air and below its melting point is called
(a) smelting
(b) roasting
(c) calcination
(d) pyrolysis
ZKK +P C OGVCNNWTIKECN HWTPCEG CP CEKF ƀWZ KU WUGF VQ TGOQXG
(a) slag
D DCUKE ƀWZ
(c) acidic gangue
(d) basic gangue 
