Aqueous solution of $\mathrm{Na}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}$ on reaction with $\mathrm{Cl}_{2}$ gives

(A) $\mathrm{Na}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}$

JEE Advanced · 2008 · 13 Apr 2008 · Paper 1 · p-Block Elements

Aqueous solution of

Na_{2} S_{2} O_{3}

on reaction with

Cl_{2}

gives

(A) $Na_{2} S_{4} O_{6}$
(B) $NaHSO_{4}$ ✓ Correct
(C)NaCl
(D)NaOH

Answer: (B)

Solution

Sodium thiosulfate reacts with chlorine in aqueous solution to undergo oxidation. The sulfur in thiosulfate (oxidation state +2) is oxidized to sulfate (oxidation state +6). The reaction is:

Na_{2} S_{2} O_{3} + 4 Cl_{2} + 5 H_{2} O ⟶ 2 NaHSO_{4} + 8 HCl

The major product is

NaHSO_{4}

(sodium hydrogen sulfate).

JEE Advanced · 2008 · 13 Apr 2008 · Paper 1 · Single correct option

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