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Question

For a very dilute solution of $${ H }_{ 3 }{ PO }_{ 3 }$$, Van’t Hoff factor is:


A
i=7
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B
i=3
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C
i=4
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D
i=5
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Solution

The correct option is A $$i=3$$
Dissociation of $$H_{3}PO_{3}$$ is as follows:

$$H_{3}PO_{3}$$  $$\rightarrow$$ $$2H^{+}  +  HPO_{3}^{-2}$$

It produces 3 ions on dissociation. Hence, Van't Hoff factor = 3.

Chemistry

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