If alpha is the degree of dissociation o...

If `alpha` is the degree of dissociation of `Na_(2)SO_(4)` , the Van't Hoff factor (i) used for calculating molecular mass is :

A

`1+alpha`

B

`1-alpha`

C

`1+2alpha`

D

`1-2alpha`

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The correct Answer is:

c

`Na_(2)SO_(4)hArr2Na^(+)+SO_(4)^(2-)`
`alpha=(i-1)/(n-1)=(i-1)/2`
`i=1+2alpha`

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