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Question

The set in which all the metals are obtained by heating their compounds/ores in air is:
$P b, C u, N i$
$K, A l, A u$
$A g, A u, Z n$
$C u, H g, A g$

A

K, A l, A u

B

P b, C u, N i

C

A g, A u, Z n

D

C u, H g, A g

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Solution

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Metals that are very low in their reactivity like $C u, H g, A g, A u$ (i.e., relatively noble) are obtained by heating their ores.

Metals of moderate reactivity like $Z n, N i, P b$ are obtained by carbon reduction. Highly reactive metals like $K, C a, A l$ are extracted by electrolytic method.

Hence, the correct set is $C u, H g, A g$ .

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