PLease Help complete the half reaction equation.Classify it as an oxidation or reduction?

Question

PLease Help complete the half reaction equation.Classify it as an oxidation or reduction

Please show me your work

a) dinitrogen oxide to nitrogen gas in an acidic solution

b)nitrite ions to nitrate ions in a basic solution

c)silver(I) oxide to silver metal in a basic solution

d)nitrate ions to nitrous acid in an acidic solution

e)hydrogen gas to water in a basic solution

Answer 1

You would be better served doing it yourself. You have to identify the atomic species undergoing a change in valance. If the valance is being decreased, the equation represents a reduction.
The opposite is also true.

In #1, N2O is the compound from which N2 is obtained. In these equations, with very rare exceptions, oxygen in a compound takes on a -2 valance and hydrogen takes on a +1 valance. Elements are assigned a zero valance. With that info, nitrogen has a +1 valance. On the RHS, nitrogen gas has a 0 valance. So there is a reduction being described.

(b) and (d) are related. Nitrate ion is NO3- and nitrite ion is NO2- . From the discussion above, the N in nitrate has a +5 valance; in nitrite, a +3 valance. Nitrous acid is HNO2.