A `0.004M` solution of `Na_(2)SO_(4)` is isotonic with a `0.010 M` solution of glucose at same temperature. The apparent degree of dissociation of `Na_(2)SO_(4)` is

Options

A. `25%`
B. `50%`
C. `75%`
D. `85%`

Answer

C

Explanation

`pi_(Na_(2)SO_(4)) = pi_(g10C^(@))`
`ixx 0.004 = 0.010`
`i= 2.5 = 1 +2 prop rArr prop = 0.75 or 75%`