WBJEE · Chemistry · Redox Reactions
In the reaction of sodium thiosulphate with \(\mathrm{I}_2\) in aqueous medium the equivalent weight of sodium thiosulphate is equal to
- 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 \(\times 2\)
Answer & Solution
Correct Answer
(A) molar mass of sodium thiosulphate
Step-by-step Solution
Detailed explanation
\(\begin{gathered} \text {Hints : } 2 \mathrm{Na}_2 \stackrel{+2}{\mathrm{~S}_2} \mathrm{O}_3+\mathrm{I}_2 \longrightarrow \mathrm{Na}_2 \stackrel{+25}{\mathrm{~S}_4} \mathrm{O}_6+2 \mathrm{NaI} \\ \text {n-factor }=1 \\ \mathrm{E}=\frac{\mathrm{M}}{1}=\mathrm{M} \end{gathered}\)
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