1.

Assign oxidation number to the underlined elements in each of the following species : Naul(B)H_(4)

Answer»

Solution :In `NaBH_(4)`, H is present as `H^(-)` ion because it is a hydride. THEREFORE, oxidation NUMBER of H in it is -1.
`OVERSET(+1)(NA)overset(x)(B)overset(-1)(H_(4))`
`(+1)+(x)+[(-1)xx4]=0`
or `x=+4-1=+3`
`:.` The oxidation number of B in `NaBH_(4)` is +3.


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