Question

Determine the oxidation number of the element in the bold in the following species
`(i)SiH_(4),(ii)BH_(3),(iii)Bf_(3),(iv)S_(2)O_(3)(2-),(v)BrO_(4)^(-),(vi)HPO_(4)^(2-)`

Answer 1

`(i) SiH_(4) :overset(x)Sioverset(+1)H_(4) X+4(+1)=0 or x=-4`
`(ii)BH_(3) :overset(x)Boverset(+1)H_(3) X+3(+1)=0 or x=-3`
`(iii)Bf_(3) : overset(x)Boverset(-1)F_(3) X+3(-1)=0 or X=+3 `
`(iv)S_(2)O_(3)^(2-) : overset(x)S_(2)overset(-2)O_(3) 2(x)+(-2)=-2 or X=+7`
`(v) BrO_(4)^(-): overset(x)Broverset(-2)O_(4) X=4(-2)=-1 or X=+7`
`(vi)HPO_(4)^(2-) : overset(+1)Hoverset(x)Poverset(-2)O_(4) (+1)+X+4(-2)=-2 or X=+5`