Select the correct statements about thiosulfate S2O3^2- (S-SO3 skeleton) and tetrathionate S4O6^2- (O3S-S-S-SO3).

The average oxidation number of S in S2O3^2- is +2

Each of the two inner sulfur atoms of S4O6^2- is 0

The average S oxidation number is higher in S4O6^2- than in S2O3^2-

The average oxidation number of S in S2O3^2- is +2

Each of the two inner sulfur atoms of S4O6^2- is 0

The average S oxidation number is higher in S4O6^2- than in S2O3^2-

The terminal sulfur atoms of S4O6^2- are at +6

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3rx053

Select the correct statements about thiosulfate $S X_{2} O X_{3} X^{2 -}$ ( $S - SO X_{3}$ skeleton) and tetrathionate $S X_{4} O X_{6} X^{2 -}$ ( $O X_{3} S - S - S - SO X_{3}$ ).

AThe average oxidation number of S in $S X_{2} O X_{3} X^{2 -}$ is $+ 2$
BEach of the two inner sulfur atoms of $S X_{4} O X_{6} X^{2 -}$ is $0$
CThe average S oxidation number is higher in $S X_{4} O X_{6} X^{2 -}$ than in $S X_{2} O X_{3} X^{2 -}$
DThe terminal sulfur atoms of $S X_{4} O X_{6} X^{2 -}$ are at $+ 6$

In thiosulfate,

2 x + 3 (- 2) = - 2

gives average S

= + 2

, so A is true. In tetrathionate (

O X_{3} S - S - S - SO X_{3}

), the two inner S bonded only to S are

0

and each terminal S is

+ 5

(since

x + 3 (- 2) = - 1

), so B is true and D is false. Average S in

S X_{4} O X_{6} X^{2 -}

+ 2.5

, which is higher than

+ 2

, so C is true.