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Question
Assertion (A) : Osmotic pressure is a colligative property.
Reason (R) : Osmotic pressure is proportional to the molality.
Options
Both (A) and (R) are true and (R) is the correct explanation of (A).
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
(A) is true, but (R) is false.
(A) is false, but (R) is true.
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Solution
(A) is true, but (R) is false.
Explanation:
Assertion is correct because osmotic pressure is a colligative property but reason is incorrect because osmotic pressure of a solution at any temperature T depends on the molar concentration not on molality.
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RELATED QUESTIONS
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Choose the most correct option.
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In isotonic solutions:
(i) Solute and solvent both are same.
(ii) Osmotic pressure is same.
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How will you determine molar mass of solute from osmotic pressure?
The 'X' g nonvolatile solute having molar mass 196 g mol-1 is dissolved in 3 dm³ water. Calculate the value of 'X' if resulting solution has osmotic pressure 0.8 atm at 300 К.
(R = 0.0821dm³ atm K-1 mol-1)
