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AIIMS 2019 Chemistry Colligative Properties MCQ Question

Type: MCQ-numerical-Medium-Class 12

In isolated system, find the condition for spontaneous reaction.

A

ΔU=0,ΔS=0,ΔG=0\Delta\text{U} = 0, \Delta\text{S} = 0, \Delta\text{G} = 0

B

ΔU<0,ΔS>0,ΔG<0\Delta\text{U} < 0, \Delta\text{S} > 0, \Delta\text{G} < 0

C

ΔU=0,ΔS>0,ΔG<0\Delta\text{U} = 0, \Delta\text{S} > 0, \Delta\text{G} < 0

D

ΔU<0,ΔS<0,ΔG<0\Delta\text{U} < 0, \Delta\text{S} < 0, \Delta\text{G} < 0

Correct Answer

Option C

Detailed Explanation

To find the mass of NaCl (Wₙₐₗ) using the provided formula, we rearrange option (A) to isolate Wₙₐₗ:

WNaCl=58.5×5002×0.52×1000W_{NaCl} = \frac{58.5 \times 500}{2 \times 0.52 \times 1000}

Calculating this gives Wₙₐₗ = 28.125 g, confirming option (C) as correct. Options (A) and (B) are either misformatted or do not directly lead to the correct mass of NaCl, making them incorrect. Understanding how to manipulate these equations is essential for solving problems related to colligative properties in solutions.

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