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Q.

Equivalent weight of H3PO2 when it disproportionates into PH3 and H3PO3 is (mol. wt. of H3PO2 = M)

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a

M

b

3M4

c

M2

d

M4

answer is B.

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Detailed Solution

H3PO2 → PH3P+ + 4e- → p3- ∴ Eq. wt. H3PO2 = M/4 H3PO2 → H3PO3 P+ → P3+ + 2e- ∴ Eq. wt. H3PO2 = M/2 Hence, Eq. wt. H3PO2 = M4 + M2=34 M

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