Thiosulphuric acid $H_{2} S_{2} O_{3}$ has structure similar to that of sulphuric acid except that the terminal oxygen atom has been replaced by a sulphur atom. Which of the following physical and chemical properties of thiosulphuric acid and sulphuric acid are likely to differ

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Thiosulphuric acid is less stable than sulphuric acid

Thiosulphuric acid is good reducing agent while conc sulphuric acid act as oxidizing acid

Boiling point of $H_{2} S_{2} O_{3}$ is less than $H_{2} S O_{4}$

Thiosulphuric acid is less acidic than sulphuric acid

answer is A, B, C, D.

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Detailed Solution

Due to the replacement of one of the oxygen atom in sulphuric acid with sulphur atom , it should be expected that aqueous solution of $H_{2} S_{2} O_{3}$ should be less acidic since more negative oxygen atom is replaced by less electronegativity sulphur atom. Since hydrogen bonding decreases in $H_{2} S_{2} O_{3}$ compared to $H_{2} S O_{4}$ due to replacement of more electronegativity oxygen atom by less electronegativity sulphur atom boiling point of $H_{2} S_{2} O_{3}$ might be expected lesser than $H_{2} S O_{4}$ .