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Question

Equivalent weight of H3PO4 in each of the reaction will be respectively:
H3PO4+OHH2PO4+H2O
H3PO4+2OHHPO24+2H2O
H3PO4+3OHPO34+3H2O

A
98, 49, 32.67
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B
49, 98, 32.67
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C
98, 32.67, 49
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D
32.67, 49, 98
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Solution

The correct option is A 98, 49, 32.67
Equivalent weight=Molecular weightn-factor
In these reactions, the n-factor is the number of H+ released.
In first reaction, one H+ is released so n-factor is one.
Therefore, Equivalent weight = Molecular weight
Molecular weight of H3PO4 = 98
Equivalent weight of H3PO4 = 98

In second reaction, n-factor is 2
Equivalent weight of H3PO4=982=49

In third reaction, n-factor is 3
Equivalent weight of H3PO4=983=32.67
Hence, option (a) is correct.


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