What are oxidation numbers of
(a) `S "in" Na_(2)S_(2)`
(b) `V` in `VO_(2)^(+)` (dioxovanadium `V`)
(c ) `H` in `LiAlH_(4)`
(d) `V` in `VO^(2+)`(oxovanadium `IV`)
(e ) `V` in `HV_(6)O_(17)^(3-)`
(f) `P` in `P_(4)S_(6)`

Explanation

(a) `-1` , (b) `+5`, (c ) `-1`, (d) `+4`, (e) `+5`, (f) `+3`