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Question
The conversion of concentrated ore into metal oxide is required because:
The conversion of concentrated ore into metal oxide is required because:
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Solution
The correct options are
A Reduction of metal oxide is thermodynamically feasible
B Impurities like As, Sb, S are removed as their volatile oxides
C Organic impurities are burnt away.
D It makes ore porus
(a) Reduction of metal oxides is thermodynamically feasible. Feasiblity is determines by Gibbs energy (ΔG) vs T plot for formation of some oxides (Ellingham diagram).
(b) During roasting, impurities of As, Sb, S are removed in the form of their volatile oxides.
(c) Organic impurities are burnt away as they are volatile.
(d) During calcination, the organic matter, moisture and the volatile impurites such as carbon dioxide and sulphur dioxide escape from the ore. This makes the ore porous.
A Reduction of metal oxide is thermodynamically feasible
B Impurities like As, Sb, S are removed as their volatile oxides
C Organic impurities are burnt away.
D It makes ore porus
(a) Reduction of metal oxides is thermodynamically feasible. Feasiblity is determines by Gibbs energy (ΔG) vs T plot for formation of some oxides (Ellingham diagram).
(b) During roasting, impurities of As, Sb, S are removed in the form of their volatile oxides.
(c) Organic impurities are burnt away as they are volatile.
(d) During calcination, the organic matter, moisture and the volatile impurites such as carbon dioxide and sulphur dioxide escape from the ore. This makes the ore porous.
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