Question

Pick the odd member from the list giving reasons:

Copper oxide, aluminium oxide, sodium oxide, magnesium oxide.

Answer 1

Copper oxide

Reason:

Copper oxide, because \[\ce{CuO}\] is less reactive can be reduced by \[\ce{C}\], \[\ce{CO}\] or by hydrogen whereas \[\ce{Al2O3}\], \[\ce{Na2O}\], \[\ce{MgO}\] are reduced by electrolysis.