Which of the following oxides cannot be reduced by coke?

C u_{2} O, K_{2} O

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F e_{2} O, Z n O

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C a O, K_{2} O

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P b O, F e_{3} O_{4}

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Solution

The correct option is C $C a O, K_{2} O$
Oxides of strong elecropositive metals such as $K, C a, N a, A l$ and $M g$ are very stable. It is difficult to reduce them into metallic state by carbon reduction.
Such metals are extracted by passing electricity through their fused chlorides/oxides/hydroxides.

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Similar questions

A metallic oxide which cannot be reduced by coke.

N a_{2} O, K_{2} O, S O_{2}, S O_{3}, C O_{2}, Z n O, A l_{2} O_{3}

(N O_{2}, K_{2} O, Z n O)

M g O, K_{2} O, {N a}_{2} O, C a O

{K O}_{2}

{K_{2} O}_{2}

K_{2} O

{N O}_{2}

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