The formula of metal phosphite is MHPO₃, the formula of the metal hypophosphite is

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M₂(H₂PO₂)₃

M(H₂PO₂)₂

M(H₂PO₂)₃

MH₂PO₂

answer is B.

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Detailed Solution

Metal phosphate formula is ${MHPO}_{3}$ thus charge on metal is +2

Hypophosphite ion contains a charge -1 hence 2 of such ions should combine with metal to neutralize its +2 hence the formula for metal hypophosphite is $M {(H_{2} {PO}_{2})}_{2}$

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