Question

Solutions A, B, C and Dare respectively 0.2 M urea, 0.10 M NaCl, 0.05 M BaCl₂ and 0.05 M AICl₃. All solutions are isotonic with each other except ______.

Options

• B

• A

• D

• C

Answer 1

Solutions A, B, C and Dare respectively 0.2 M urea, 0.10 M NaCl, 0.05 M BaCl₂ and 0.05 M AICl₃. All solutions are isotonic with each other except B.

Explanation:

Isotonic solution have the same osmotic pressure.

The osmotic pressure of 0.2 M urea (A).

π = iMRT

= 1 × 0.2 RT

= 0.2 RT

The osmotic pressure of 0.10 M NaCl(B).

π = iMRT

= 2 × 0.1 RT

= 0.2 RT

The osmotic pressure of 0.05 M BaCl₂ (C).

π = iMRT

= 3 × 0.05 RT

= 0.15 RT

The osmotic pressure of 0.05 AICl₃ (D).

π = iMRT

= 4 × 0.05 RT

= 0.2 RT

Hence, all solution are isotonic with each other except solution C.