Question

S has two different oxidation states in pyrosulphurous acid (H2S205). What is difference between two
oxidation states of S in H2S205
(a) 4
(b) 2
(c) 7
(d) 6​

Answer 1

the two oxidation states in H2S2O5 of S are are 6 and 4 so the difference will be equals to 2

so b is correct

Answer 2

Explanation:

H2S2O5

let oxidation state of sulphur be x

oxidation state of H =+1

oxidation state of O= -2

Therefore

+1×2 + 2x + 5× (-2) = 0

2x = +10 -2

x = +8/2

x = +4

Hence , oxidation state of S in H2S2O5 is +4