Question

When sulphur is heated with NaOH (aq)? The compounds formed are
(a) Na₂S + H₂O
(b) Na₂SO₃ + H₂O
(c) Na₂S + Na₂S₂O₃ + H₂O
(d) Na₂S₂O₃ + H₂O

Answer 1

Given : sulphur is heated with NaOH (aq).

To check : The compound formed are ;

(a) Na₂S + H₂O

(b) Na₂SO₃ + H₂O

(c) Na₂S + Na₂S₂O₃ + H₂O

(d) Na₂S₂O₃ + H₂O

solution : sulphur reacts with sodium hydroxide (strong base) to produce sodium sulphide, sodium thiosulfate and water.

3S + 6NaOH ⇒2Na₂S + Na₂S₂O₃ + 3H₂O

it is disproportionation reaction. here sulphur oxidizes from zero to + 4 in sodium thiosulfate and reduces from zero to - 2 in sodium sulphide.

Therefore option (c) is correct choice.

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