Question

Solutions A, B, C and Dare respectively 0.2 M urea, 0.10 M NaCl, 0.05 M BaCl₂ and 0.05 M AlCl₃. All solutions are isotonic with each other except ______.

Options

• C

• D

• A

• B

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 AlCl₃. All solutions are isotonic with each other except C.

Explanation:

1. `pi_"Urea" = 1 xx 0.2 "RT" = 0.2 "RT"`
2. `pi_"NaCl" = 2 xx 0.1 "RT" = 0.2 "RT"`
3. `pi_("BaCl"_2) = 3 xx 0.05 "RT" = 0.15 "RT"`
4. `pi_("AlCl"_3) = 4 xx 0.05 "RT" = 0.2 "RT"`

∴ All solutions are isotonic with each other except C.