Which of the following metals cannot be obtained from their compounds by heating with carbon?

Sodium (Na)

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Potassium (K)

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Zinc (Zn)

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Both (A) & (B)

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Solution

The correct option is D Both (A) & (B)
The metals high up in the reactivity (Na, Mg, Ca, Al) series are very reactive. They cannot be obtained from their compounds by heating with carbon. This is because their metals have more affinity for oxygen than do for carbon.

These metals are thus obtained by electrolytic reduction.

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