JEE Main · 2019 · 10 Apr 2019 · Shift 1 · p-Block Elements

The oxoacid of sulphur that does not contain bond between sulphur atoms is:

(A) $H_{2} S_{2} O_{3}$
(B) $H_{2} S_{2} O_{4}$
(C) $H_{2} S_{2} O_{7}$ ✓ Correct
(D) $H_{2} S_{4} O_{6}$

Answer: (C)

Solution

Among the oxoacids of sulphur, thiosulphuric acid

H X_{2} S X_{2} O X_{3}

and dithionous acid

H X_{2} S X_{2} O X_{4}

both hold a direct

S - S

bond, and tetrathionic acid

H X_{2} S X_{4} O X_{6}

carries a chain of

S - S

bonds. Pyrosulphuric acid

H X_{2} S X_{2} O X_{7}

, however, joins its two

SO X_{3}

units through an oxygen bridge,

S - O - S

, so it is the one with no sulphur-sulphur bond.

JEE Main · 2019 · 10 Apr 2019 · Shift 1 · Single correct option

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