Question

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

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

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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