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  4. In the reaction of sodium thiosulphate with I2 in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

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Q. In the reaction of sodium thiosulphate with $I_2$ in aqueous medium, the equivalent weight of sodium thiosulphate is equal to

WBJEEWBJEE 2010Some Basic Concepts of Chemistry

Solution:

$2 Na _{2}\, \overset{+2}{S _{2}}\, O _{3}+ I _{2} \longrightarrow Na _{2}\,\overset{+2.5}{ S _{4}}\, O _{6}+2 NaI$
$n$-factor $=1$
$E=\frac{M}{1}=M$