1.

The oxidation number of sulphur in `Na_2S_4O_6` is .A. `2/3`B. `3/2`C. `3/5`D. `5/2`

Answer» Correct Answer - D
Let O.S. of S in `Na_2S_4O_6`=x
`therefore2xx(+1)+4xx x +6(-2)=0`
2+ 4x - 12 =0
`x=5/2`


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