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Question

In the reaction 2NaOH+H3PO4Na2 HPO4+2H2O the equivalent weight of the acid is

A
49
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B
98
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C
32.6
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D
36.5
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Solution

The correct option is A 49
Basicity of H3PO4 is three, but only two hydrogen atoms are replaced in the product therefore
Mw2=982=49

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