Match the conversions in Column - I with the type(s) of reaction(s) given in Column - II.
Column-I | Column-II | ||
(a) | PbS → PbO | (p) | Roasting |
(b) | CaCO3 → CaO | (q) | Calcination |
(c) | ZnS → Zn | (r) | Carbon reduction |
(d) | Cu2S → Cu | (s) | Self reduction |
Text Solution
Verified by ExpertsA
(A - p) ; (B - q) ; (C - p,r) ; (D - p, s)
Sol. 2PbS + 3O 2 
2PbO + 2SO 2
Sulphides are generally roasted for self reduction or for converting into their oxides which are then reduced by carbon or carbon monoxide to get metal.
CaCO 3 
CaO + CO 2
Carbonates and hydrated ores are calcined to convert into their oxides.
2ZnS + 3O 2 
2ZnO + 2SO 2
ZnO + C 
ZnCO
From copper glance i.e. Cu 2 S, the copper is extracted by first heating the ore in reverberatory furnace at moderate temperature i.e. roasted and then supply of air is cut off and then temperature is increased so that roasted mass melts. At this point self reduction takes place and blister copper is obtained.
Cu 2 S + 3O 2 
6Cu + SO 2 ; Cu 2 S + 2Cu 2 O 
6Cu + SO 2
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