The formula of metal phosphite is ${M H P O}_{3}$ , the formula of the metal hypophosphite is

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${M H}_{2} {P O}_{2}$

$M {(H_{2} {P O}_{2})}_{2}$

$M {(H_{2} {P O}_{2})}_{3}$

$M_{2} {(H_{2} {P O}_{2})}_{3}$

answer is B.

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Detailed Solution

Metal phosphate formula is ${M H P O}_{3}$ 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 $M {(H_{2} {P O}_{2})}_{2}$

Hence option B is the correct answer.

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