Calculate the oxidation number of sulphur, chromium and nitrogen ion `H_(2)SO_(5), Cr_(2)O_(7)^(2-)andNO_(3)^(-)`. Suggest structure of those compounds.

Explanation

`H_(2)SO_(5)` Structure.:
`HO-underset(O)underset(darr)overset(O)overset(darr)S-O-O-H`
2(1)+X+2(-1)+3(-2)=0 (One peroxy linkage)
2 + X -2-6=0
X=+6
(b) `Cr_(2)O_(7)^(-2)` Structure :
`underset(O^(Theta))underset(|)underset(CrO_(2))underset(\\)underset(O)underset(/)underset(CrO_(2))underset(|)underset(O_(Theta))`
2(xx)+7(-2)=-2
2 xx -14=-2
xx = +6
`NO_(3)` Structure :


X + 3(-2)=-1
X - 6 =-1
X = +5