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Fovivalent weight of a substance in acidie mediught of ${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$ as oxidant 40. The equivalent weight of Bayer's reagent is $\begin{array}{llll}\text{ 1) }24.5& \text{ 2) }49& \text{ 3) }147& \text{ 4) }296\\ \text{ 1) }31.6& \text{ 2) }52.6& \text{ 3) }79& \text{ 4) }158\end{array}$ 41. Molecular weight of $\mathrm{KMn}{\mathrm{O}}_4$ is reduced to ${\mathrm{K}}_2\mathrm{M}$ $\begin{array}{llll}\text{ 1) }M& \text{ 2) }\frac{M}{2}& \text{ 3) }\frac{M}{3}& \text{ 4) }\frac{M}{5}\end{array}$ 42. When Ferrous sulphate acts as reductant, its equivalent weight is

1. twice that of its molecular weight $\mathrm{Fer}{\mathrm{O}}_1-{\mathrm{Fr}}^{+3}$
2. equal to its molecular weight
3. one-half of its molecular weight
4. one-third of its molecular weight

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