Q23 / 160 · TS EAMCET 2013 · Chemistry

$\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3$ reacts with moist $\mathrm{Cl}_2$ to form $\mathrm{Na}_2 \mathrm{SO}_4, \mathrm{HCl}$ and $X$. Which one of the following is $X$ ?

  • A
    $\mathrm{H}_2 \mathrm{~S}$
  • B
    $\mathrm{SO}_2$
  • C
    $\mathrm{SO}_3$
  • Correct answer
    D
    $\mathrm{S}$

Solution

Sodium thiosulphate is oxidised by moist $\mathrm{Cl}_2$ or chlorine water and precipitates sulphur, $$ \begin{aligned} & \mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3+\mathrm{Cl}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow \mathrm{Na}_2 \mathrm{SO}_4+2 \mathrm{HCl} \\ & \text { sodium } \\ & \text { thiosulphate } \end{aligned} $$

Hence, the correct answer is option: 'D'.

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