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(i). Which of the following oxides is re...

(i). Which of the following oxides is reduced by hydrogen?
`MgO,CuO` and `Na_(2)O`
(ii). Which of the following oxides will decompose on heating ?
ZnO, CuO, MgO, and `Ag_(2)O`
(iii). The value of `E_(OX)^(@)` for electrode reaction.
`FetoFe^(2+)+2e^(-)" "CutoCu^(2+)2e^(-)` and `ZntoZn^(2+)+2e^(-)`
are 0.444, `-0.337` and `0763` volt respectively. State which of these metals can replace the orther two from the solution of their salts?

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