First slide

General methods of extraction of elements from the earth crust

Question

Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is

Difficult

A

$C u_{2} O, S n O_{2}$
B

$F e_{2} O_{3}, Z n O$
C

$C a O, K_{2} O$
D

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

Solution

Ca and K are strong reducing agents, hence their oxides can not be reduced with carbon

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