Which of the following aqueous solutions has the lowest osmotic pressure at same temperature? a) 0.2 M MgSO4 b) 0.2 M CaCl2 c) 0.2

Which of the following aqueous solutions has the lowest osmotic

pressure at same temperature?
a) 0.2 M MgSO4
b) 0.2 M CaCl2
c) 0.2 M glucose
d) 0.2 M Naci
e) 0.2 M acetic acid (a weak acid)