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Explain the question: Identify incorrect statement about polythionic acids.

Concept: Oxidation state and structure of polythionic acids.

Solution:

Polythionic acids have general formula H₂S_nO₆

As n increases, average oxidation state decreases

Hence it increases when number of S atoms decreases → statement 1 correct

Number of S–S bonds in chain = (n − 1) → statement 2 correct

All sulfur atoms show sp³ hybridisation → statement 4 correct

Statement saying oxidation state increases with increase in S atoms is wrong

Terminal S atoms are in +5 oxidation state while in central S atoms are in zero oxidation state