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Study the Assertion and Reason and choose the correct option.
Osmotic pressure of 0·5 molar KCl solution is more than that of 0·5 molar urea solution.
Assertion: Osmotic pressure of $0\cdot5\text{ molar}$ $\text{KCl}$ solution is more than that of $0\cdot5\text{ molar}$ urea solution.
Reason: $\text{KCl}$ solution has a greater number of particles than urea solution.
- (a)Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
- (b)Both Assertion and Reason are true but Reason is not the correct explanation for Assertion.
- (c)Assertion is true and Reason is false.
- (d)Both Assertion and Reason are false.
Answer
Answer
Correct option: (a)
Answer: (a) Both Assertion and Reason are true and Reason is the correct explanation for Assertion.
KCl dissociates into $\mathrm{K^+}$ and $\mathrm{Cl^-}$ ($i \approx 2$) while urea does not dissociate ($i = 1$). Osmotic pressure is a colligative property depending on the number of particles, so KCl has the higher osmotic pressure.