0 . 004M K _ 2 SO _ 4 solution is isotonic with 0 . 01M glucose...

Osmotic pressure $\pi = iCRT$

$i =$Van't Hoff Factor

$C =$Molarity

$R =$Same gas constant

$T =$Temperature

For isotonic solutions, osmotic pressure are equal, Hence, we have

$( 0 . 004 ) \times i = 0 . 01$

$⇒ i = \dfrac{0 . 01}{0 . 004}$

$= \dfrac{10}{4} = \dfrac{5}{2} = 1 + 2\alpha$

$2\alpha = 1 . 5$

$\alpha = 0 . 75$

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