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Q.

Identify correct statements from the following.A) Reduction of metal oxide to liquid metal is easier than metal oxide to solid metal at a given temperature.B) Entropy for a liquid metal is more than for a solid metal. C) Reduction of Al2O3 using Mg is economical.D) Smelting is a pyrometallurgical process.

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a

A, B and C only

b

A, B and D only

c

B, C and D only

d

A, C and D only

answer is B.

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Detailed Solution

Since entropy of a liquid is more than a solid it is easy to obtain metal in liquid state.Reduction of Al2O3 using Mg is uneconomical and technologically difficult.Study of effect of heat or temperature in the extraction of a metal is called pyrometallugy.
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