MetallurgyHard

Question

Hydrogen gas will not reduce :

Options

A.heated cupric oxide
B.heated ferric oxide
C.heated stannic oxide
D.heated aluminium oxide

Solution

Cupric oxide is reduced as copper is less electropositiv than hydrogen en. Fe3+ and Sn4+ are reduced by hydrogen to Fe2+ and Sn2+ respectively. Al is highly electropositive and so H can,t reduce it .

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