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Question

If $$\alpha$$ is the degree of dissociation of $${Na}_{2}{SO}_{4}$$, the vant Hoff's factor ($$i$$) used for calculating the molecular mass is:


A
1+α
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B
1α
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C
1+2α
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D
12α
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Solution

The correct option is D $$1+2\alpha$$
For $${ Na }_{ 2 }{ SO }_{ 4 }:-i=n$$
$${ Na }_{ 2 }{ SO }_{ 4 }\longrightarrow \underbrace { { 2Na }^{ + }+{ SO }_{ 4 }^{ 2- } } $$
                                   $$n=2$$
$$i=1-\alpha +n\alpha $$
$$i=1-\alpha +2\alpha $$
$$i=1+2\alpha $$

Chemistry

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