II. 1 M KCl III. 1 M benzoic acid in benzene. IV. 1 M (NH3)3PO4 Which of the following is/are true?
All solutions are isotonic.
III is hypotonic of I,II and IV.
I,II and III are hypertonic of IV.
IV is hypertonic of I,II and III
A
All solutions are isotonic.
B
IV is hypertonic of I,II and III
C
III is hypotonic of I,II and IV.
D
I,II and III are hypertonic of IV.
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Solution
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The solutions which have the same osmotic pressure are called isotonic solutions.
Osmotic pressure =i×cs×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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