Sodium thiosulphate is prepared by
(a) reducing Na₂SO₄ solution with H₂S
(b) boiling Na₂SO₃ solution with S in alkaline medium
(c) neutralising H₂S₂O₃ solution with NaOH
(d) boiling Na₂SO₃ solution with S in acidic medium
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A IS CORRECT ANSWER
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