A) \[C{{u}_{2}}O,Sn{{O}_{2}}\]
B) \[CaO,{{K}_{2}}O\]
C) \[PbO,F{{e}_{2}}{{O}_{4}}\]
D) \[F{{e}_{2}}{{O}_{3}},ZnO\]
Correct Answer: B
Solution :
Ca and K are strong reducing agents, hence their oxides can not be reduced with carbon.
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