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Sodium thiosulphate is formed when:

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H₂S₂O₃ is neutralised by NaOH

SO₂ is boiled into Na₂S

Na₂SO₃ is boiled with elemental sulphur

Na₂SO₄ is reduced by zinc dust

answer is B.

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Detailed Solution

${Na}_{2} {SO}_{3} + S_{8} \overset{Boiling}{⟶} {Na}_{2} S_{2} O_{3} (Sodium thiosulphate)$
Acid is neutralised bY base in (c).

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