JEE Main Chemistry question

Sodium thiosulphate is prepared by

(A)Boiling solution with S in alkaline mediumCorrect
(B)Reducing solution with
(C)Boiling solution with S in acidic medium
(D)Neutralising solution with NaOH

Answer: (A)

Solution

Sodium thiosulphate is prepared by boiling an alkaline solution of sodium sulphite with sulphur: , the alkaline medium being necessary because thiosulphate decomposes in acidic conditions (ruling out

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Question ID VK-137685