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C+6 rO42−++2+2 S2 O32− → S+6 O42−+C+3 r(OH)4−\stackrel{+6}{\mathrm{C}} \mathrm{rO}_4^{2-}+\stackrel{+2}{+2} \mathrm{~S}_2 \mathrm{O}_3^{2-} \rightarrow \stackrel{+6}{\mathrm{~S}} \mathrm{O}_4^{2-}+\stackrel{+3}{\mathrm{C}} \mathrm{r}(\mathrm{OH})_4^{-}\\C+6 rO42−++2+2 S2 O32− → S+6 O42−+C+3 r(OH)4−
{ gm equi. of } CrO4 2−=S2 O3 2−\mathrm{CrO}_4{ }^{2-}=\mathrm{S}_2 \mathrm{O}_3{ }^{2-}\\CrO4 2−=S2 O3 2−
0.154 × 3 × v=0.25 × 40 × 80.154 \times 3 \times v=0.25 \times 40 \times 8\\0.154 × 3 × v=0.25 × 40 × 8
v=173.16=173 mlv=173.16=173 \mathrm{ml}v=173.16=173 ml
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