An aqueous solution of sodium salt gives pale yellow ppt and a gas with pungent odour on reaction with warm dilute hydrochloric acid then anionic part of salt is:

Question

TestHub · Accepted Answer

When a sodium salt containing thiosulphate ion (S₂O₃²⁻) is treated with warm dilute HCl, it decomposes to form:

Yellow precipitate of sulfur (S) (pale yellow ppt)

Sulfur dioxide (SO₂) gas with a pungent smell

Reaction:

$N a_{2} S_{2} O_{3} + 2HCl \to 2NaCl + S O_{2} ↑ + S ↓ + H_{2} O$

Therefore, the anion present is thiosulphate (S₂O₃²⁻).

Chemistry - Salt Analysis Question with Solution | TestHub

Options:

Doubts & Discussion

JEE Main 2027 (Class 12)