Match list-I with list-II. (Assuming all the solutes are non volatile and all solutions are ideal.)
List-I (Experiment)
List-II (Result)
(P)
10 milli moles of $H g I_{2}$ are added to 10 ml of 2 M aqueous Nal
(1)
Osmotic pressure of solution increases
(Q)
10 milli moles of KCl are added to 10 ml of 1 M aqueous NaCl
(2)
Vapour pressure of solution increases
(R)
10 ml 0.1 M NaOH aqueous solution added to 10 ml of 0.1 M HCl aqueous solution
(3)
Boiling point of solution increases
(S)
10 ml of 0.1 M NaOH aqueous solution added to 10 ml of 0.1 M $C H_{3} C O O H$ aqueous solution
(4)
Freezing point of solution increases

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$P \to 1; Q \to 4; R \to 2; S \to 4$

$P \to 2; Q \to 4; R \to 1; S \to 3$

$P \to 1; Q \to 2; R \to 1; S \to 2$

$P \to 2; Q \to 4; R \to 2; S \to 4$

answer is B.

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Detailed Solution

When the solution are mixed number of particles per unit volume decreases.

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List-I (Experiment)		List-II (Result)
(P)	10 milli moles of $H g I_{2}$ are added to 10 ml of 2 M aqueous Nal	(1)	Osmotic pressure of solution increases
(Q)	10 milli moles of KCl are added to 10 ml of 1 M aqueous NaCl	(2)	Vapour pressure of solution increases
(R)	10 ml 0.1 M NaOH aqueous solution added to 10 ml of 0.1 M HCl aqueous solution	(3)	Boiling point of solution increases
(S)	10 ml of 0.1 M NaOH aqueous solution added to 10 ml of 0.1 M $C H_{3} C O O H$ aqueous solution	(4)	Freezing point of solution increases