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Which of the following metal can be extracted just by heating their sulphide in the air?

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Potassium

Zinc

Sodium

Copper

answer is D.

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Detailed Solution

Less electropositive metals or metals placed at the low of the metal reactivity series can be extracted by heating their sulphide in the air.

In all four options, Copper is a less reactive metal and placed low in the reactivity series.

Hence, copper can be extracted just by heating their sulphide in the air.

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