Answers

2016-04-13T00:05:25+05:30
1)Na is oxidised and O2 is reduced
2)CuO is reduced and H2 is oxidised
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2016-04-13T13:28:49+05:30
1 na has gained o2 to form na20.. hence  na has been oxidised to na2o...therefore o2 has been reduced
2  cuo has lost  o2 to form cu.hence  cuo has been reduced to cu.h2 has gained o2 to form h20 ..hence h2 has been oxidised to h20
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