Q9 / 160 · WBJEE 2010 · Chemistry

In the reaction of sodium thiosulphate with $\mathrm{I}_2$ in aqueous medium the equivalent weight of sodium thiosulphate is equal to

  • Correct answer
    A
    molar mass of sodium thiosulphate
  • B
    the average of molr masses of $\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3$ and $\mathrm{I}_2$
  • C
    half the molar mass of sodium thiosulphate
  • D
    molar mass of sodium thiosulphate $\times 2$

Solution

$\begin{gathered} \text {Hints : } 2 \mathrm{Na}_2 \stackrel{+2}{\mathrm{~S}_2} \mathrm{O}_3+\mathrm{I}_2 \longrightarrow \mathrm{Na}_2 \stackrel{+25}{\mathrm{~S}_4} \mathrm{O}_6+2 \mathrm{NaI} \\ \text {n-factor }=1 \\ \mathrm{E}=\frac{\mathrm{M}}{1}=\mathrm{M} \end{gathered}$

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

Relevant Questions