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Q.

Auto reduction process is used in extraction of

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a

$Cu$

b

$Hg$

c

$Al$

d

$Fe$

answer is A, B.

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Detailed Solution

${Cu}_{2} S + 2 {Cu}_{2} O ⟶ 6 Cu + {SO}_{2}$ ;

$HgS + 2 HgO ⟶ 3 Hg + {SO}_{2}$ . $(c)$ and $(d)$ are not possible.

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Auto reduction process is used in extraction of