pBlock ElementsII 1 Question 34
34. Sodium thiosulphate is prepared by
(a) reducing $\mathrm{Na} _{2} \mathrm{SO} _{4}$ solution with $\mathrm{H} _{2} \mathrm{S}$
(b) boiling $\mathrm{Na} _{2} \mathrm{SO} _{3}$ solution with $\mathrm{S}$ in alkaline medium
(c) neutralising $\mathrm{H} _{2} \mathrm{S} _{2} \mathrm{O} _{3}$ solution with $\mathrm{NaOH}$
(d) boiling $\mathrm{Na} _{2} \mathrm{SO} _{3}$ solution with $\mathrm{S}$ in acidic medium
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Answer:
Correct Answer: 34. (b)
Solution:
- $\mathrm{Na} _{2} \mathrm{SO} _{3}+\mathrm{S} \xrightarrow[\Delta]{\mathrm{OH}^{-}} \mathrm{Na} _{2} \mathrm{S} _{2} \mathrm{O} _{3}$
