Question

The oxidation number of sulphur in $H_2SO_4, H_2S_2O_4 \, and \, H_2S_2O_6$ are respectively

• A. +3, +4, +5
• B. +5, +4, +3
• C. +6, +3, +5
• D. +3, +5, +4

Answer 1

Answer: (C)

+6, +3, +5

Answer 2

O.N. of S in $H_2SO_4$: Let O.N. of S = x .-. 2 (+ 1) + x + 4(-2) = 0 $\Rightarrow x=+6$ O.N. of S in $H_2S_2O_4$ Let O.N. of S = x =2(4-1) + l x + 4(-2) = 0 $\Rightarrow x=+3$ O.N. of S in $H_2S_2O_ 6$ Let O.N. of S = x 2(4-1) + 2x + 6(-2) = 0 $\Rightarrow x=+5$