Question

Assume 100% ionisation in the following equimolal aqueous solution :

(a) 1m CaCl₂ (b) 1m sucrose (c) 1m AlCl₃ (d) 1m KCl

Arrange them in the increasing order of osmotic pressure:

• A. A<D<B<C
• B. B<D<A<C
• C. C<A<D<B
• D. A<B<D<C

Answer 1

The correct option is B

B<D<A<C

Osmotic pressure is directly proportional to the number of ions solution (for equimolal solution)

(A)CaCl₂=Ca⁺²+2Cl^- =3 ions

(B) Sucrose (C₁₂ H₂₂ O₁₁) Non electrolyte =1

(C) AlCl₃ →Al⁺³ +3Cl^- =4ions

(D) KCl→K⁺ +Cl^- =2

B<D<A<C