Q. The oxidation number of sulphur in $N a_{2} S_{4} O_{6}$ is

2014 182 Rajasthan PMTRajasthan PMT 2002Redox Reactions Report Error

A

1.5

7%

B

2.5

63%

C

3

22%

D

2

7%

Solution:

$N a_{2}^{+ 1} S^{x} +_{4} O_{6}^{- 2} = 2 + 4 x - 12 = 0 or 4 x = 10$