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
B
1α
C
1+2α
D
12α

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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