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Q. If the molecular wt. of $Na_2S_2O_3$ and $I_2$ are $M_1$ and $M_2$ respectively, then what will be the equivalent wt. of $Na_2S_2O_3$ and $I_2$ in the following reaction?
$2 S _2 O _3^{2-}+ I _2 \longrightarrow S _4 O _6^{2-}+2 I ^{-}$

WBJEEWBJEE 2011Redox Reactions

Solution:

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$\therefore $ Equivalent mass of $S_2O_3^{2-} = \frac{M_1}{1} = M_1$
and equivalent mass of $I_2 = \frac{M_2}{2}$