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Q.
Which of the following would exert maximum osmotic pressure?
Rajasthan PETRajasthan PET 2010
Solution:
Osmotic pressure is a colligative property, ie, depends upon the number of particles of solute. Thus, the solution in which solute gives maximum number of ions, exerts maximum osmotic pressure. Number of particles, [a] In decinormal aluminium sulphate,
$ A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\xrightarrow[{}]{{}}\underbrace{2A{{l}^{3+}}+3SO_{4}^{2-}}_{5\text{ }particles} $
[b] In decinormar^barium chloride, $ BaC{{l}_{2}}\xrightarrow[{}]{{}}\underbrace{B{{a}^{2+}}+2C{{l}^{-}}}_{3\text{ }particles} $
[c] In decinormal sodium chloride, $ NaCl\xrightarrow[{}]{{}}\underbrace{N{{a}^{+}}+C{{l}^{-}}}_{2\text{ }particles} $
[d] When equal volumes of [b] and [c] are mixed, the concentration becomes half of present concentration. Thus, decinormal aluminium sulphate exerts maximum osmotic pressure.