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If the molecular weight of H(3)PO(3) is ...

If the molecular weight of `H_(3)PO_(3)` is M, its equivalent weight will be .

A

M

B

M/2

C

M/3

D

2M

Text Solution

Verified by Experts

The correct Answer is:
B
Dibasic acid `E = M//2`

Basicity of `H_(3)PO_(3)` is 2. Basicity is number of replaceable hydrogen. As in phosphoric acid there are three hydrogen atoms but only two out of them are attached to the most electronegative oxygen atom. Therefore they can easily removed (acidic).
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