AP EAMCET · Chemistry · Chemical Bonding and Molecular Structure

The correct order of Sulphur oxygen bond order in ${SO}_{3}, S_{2} O_{3}^{2 -}$ and ${SO}_{4}^{2 -}$ are

A ${SO}_{4}^{2 -} < S_{2} O_{3}^{2 -} < {SO}_{3}$
B ${SO}_{4}^{2 -} < {SO}_{3} < S_{2} O_{3}^{2 -}$
C $S_{2} O_{3}^{2 -} < {SO}_{4}^{2 -} < {SO}_{3}$
D $S_{2} O_{3}^{2 -} < {SO}_{3} < {SO}_{4}^{2 -}$

Verified Solution

Answer & Solution

Correct Answer

(C) $S_{2} O_{3}^{2 -} < {SO}_{4}^{2 -} < {SO}_{3}$

Step-by-step Solution

Detailed explanation

The SO3 has the bond order of two. The bond order of SO42-:- It has the four resonating structure. It has the four equivalent oxygen atoms and six bonds between the sulphur and oxygen. Bond order = 64=1.5 The bond order of S2O32-:- It has the three resonating structure and there…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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The correct order of Sulphur oxygen bond order in SO3, S2O32- and SO42- are

Step-by-step Solution

The correct order of Sulphur oxygen bond order in ${SO}_{3}, S_{2} O_{3}^{2 -}$ and ${SO}_{4}^{2 -}$ are