The set in which all the metals are obtained by heating their compounds/ores in air is:

K, A l, A u

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P b, C u, N i

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C u, H g, A g

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A g, A u, Z n

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Solution

The correct option is D $C u, H g, A g$
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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