Question
Wed February 15, 2012 By: Swaraj Pati

Carbon reduces copper oxide to copper but not calcium oxide to calcium. Why?

Expert Reply
Wed February 15, 2012

Carbon has electrode potential (reduction potential) lower (can reduce more easily) than Cu but higher than Ca, and hence, C can reduce Cu but not Ca. The reduction potentials are -

C-(0.13 V)

Cu-(0.16 V)

Ca-(-2.76 V)

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