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Question

What should be the equivalent weight of phosphorous acid, if P=31; O=16; H=1

A
82
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B
41
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C
20.5
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D
None of these
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Solution

The correct option is B 41
The acid is dibasic.
Molecular weight of H3PO3=3+31+48=82
Equivalent weight =Molecular weightBasicity=822=41.

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