A) Decinormal aluminium sulphate
B) Decinormal barium chloride
C) Decinormal sodium chloride
D) A solution obtained by mixing equal volumes of (b) and (c) and filtering
Correct Answer: A
Solution :
Osmotic pressure depends upon the number of particles of solute. It is a colligative property. Thus, the solute with maximum number of ions, exerts maximum osmotic pressure. (a) \[A{{l}_{2}}{{(S{{O}_{4}})}_{3}}\to 2A{{l}^{3+}}+3SO_{4}^{2-}\to 5\,\text{particles}\] (b) \[BaC{{l}_{2}}\to B{{a}^{+2}}+2C{{l}^{-}}\to 3\,\,\text{particles}\] (c) \[NaCl\to N{{a}^{+}}+C{{l}^{-}}\to 2\,\,\text{particles}\] (d) when equal volumes of \[BaC{{l}_{2}}\] and \[NaCl\] are mixed, the concentration becomes half of present concentrate. Hence, correct option is (a).
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