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Carbon can reduce copper oxide to copper but not CaO to Ca. Why?

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Carbon can reduce copper oxide to copper but not CaO to Ca. Why?
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C is a strong reducing agent and can reduce CuO as follows:
 CuO+C----->Cu+CO↑
Ca is much more reactive than Cu and has greater affinity for oxygen than C has. So, carbon cannot reduce CaO to Ca.

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