Which among the following will show maximum osmotic pressure?

N a C l

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{M g C l}_{2}

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{({N H}_{4})}_{3} {P O}_{4}

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N a_{2} S O_{4}

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Solution

The correct option is B 1M ${({N H}_{4})}_{3} {P O}_{4}$
For equi-concentration, osmotic pressure depends on Van't Hoff factor.

Higher the Van't Hoff factor, highest the osmotic pressure ( $π = i C R T$ ).
In $N a C l$ $, i = 2 (N a^{+}, C l^{-})$
In $M g C l_{2}, i = 3$
In $(N H_{4})_{3} P O_{4}$ , $i = 4$

In $N a_{2} S O_{4}$ , $i = 3$

Hence, option $C$ is correct.

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