Colligative properties depend on the number of solute particles present in the solution. Osmotic pressure of 90% ionized 0.1M BaCl2 solution at 270c is
5.4 atm
4.9 atm
6.9 atm
7.4 atm
BaCl2 ⇌Ba+2+2Cl-; n=3 i=1-α+nα; i=1+2α; i=1+1.8=2.8(given α=0.9); π=iCRT; π=2.8×0.1×0.0821×300=6.89 atm