Which of the following statements is correct? For 0.1 M solution of each

Options

A. osmotic pressure of NaCl and `Na_2 SO_4`, solution will be same
B. osmotic pressure of NaCl solution will be more than `Na_2SO_4` solution
C. osmotic pressure of `Na_2SO_4` solution will be more than NaCl solution
D. osmotic pressure of `Na_2 SO_4` could be less or more than that of NaCl solution.

Answer

C

Explanation

`NaCl to Na^+ +Cl^-, i = 2`
`Na_2SO_4 to 2Na^+ + SO_4^(2-) ,i = 3 implies pi= iCRT`
For the same concentration, `pi prop i`
Thus, osmotic pressure is more for `Na_2SO_4`.