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Consider the following solutions:
I. 1 M sucrose
II. 1 M KCI
III. 1 M benzoic acid in benzene
IV. 1 M (NH₄)₃PO₄
Which of the following is/are true?

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All solutions are isotonic.

I, II, and III are hypertonic of IV

III is hypotonic of I, II, and IV

IV is hypertonic of I, II, and III.

answer is B, C, D.

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Detailed Solution

The solutions which have the same osmotic pressure are called isotonic solutions.

Osmotic pressure = ${iC}_{s} T$

where i is the van't Hoff factor, c is the concentration of the solute and T is the temperature.

In the given four solutions, 'i' is maximum for IV as it has a maximum number of ions. So IV is hypertonic with respect to others and III is hypotonic of I,II and IV

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