Question

The oxidation number of sulphur in $Na_2S_4O_6$ is

• A. 1.5
• B. 2.5
• C. 3
• D. 2

Answer 1

Answer: (B)

2.5

Answer 2

$Na^{+1}_2 S^x+_4 O^{-2}_6=2+4x-12=0\,or\,4x=10$