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In the disproportionation reaction H(3)P...

In the disproportionation reaction `H_(3)PO_(2)toH_(3)PO_(3)+PH_(3)` (atomic mass of P=31)
Equivalent weight of `H_(3)PO_(2)`
1. As an oxidising agent is 16.5
2. As a reducing agent is 33
3. Net equivalent weight of `H_(3)PO_(2)` is 49.5
4. As an acid is 66

A

1 & 4 only

B

2 & 4 only

C

2 & 3 only

D

1,2,3,4 are correct

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