Which is/are INCORRECT statement? P (a) Equivalent mass of \( \math...

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Which is/are INCORRECT statement?
P
(a) Equivalent mass of \( \mathrm{H}_{2} \mathrm{PO}_{3}^{-} \)is 40.5 .
W
(b) Eq. mass of \( \mathrm{H}_{2} \mathrm{PO}_{4}^{-} \)may be equal to molar mass or less than molar mass because it depends on the reaction.
(c) \( \mathrm{KMnO}_{4} \) has maximum eq. mass in acidic medium.
(d) Oxidation state of \( \mathrm{H} \) in \( \mathrm{MgH}_{2} \) is greater than in \( \mathrm{H}_{2} \mathrm{O}_{2} \).
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