Which has maximum osmotic pressure at temperature `T`?
a. `100 mL` of `1 M` urea solution
b. `300 mL` of `1 M` glucose solution
c. Misture of `100 mL` of `1 M` urea solution and `300 mL` of `1 M` glucose solution
d. All are isotonic

Explanation

d. All are isotonic
Osmotic pressure `(pi)` depends upon the concentration of solution, i.e., `pi=C_("effective")RT`
For (a), `C_("effective")= 1 M` (since it is non-electrolytic solution)
For (b), `C_("effective")= 1 M` (since it is non-electrolytic solution)
For c, `C_("effective")= [100/(100 +300) xx 1 +(300)/(100 +300) xx1] =1 M`