AIIMS2019Chemistry-Thermodynamics

AIIMS 2019 Chemistry Entropy MCQ Question

Type: MCQ-conceptual-Easy-Class 11

What is the activation energy (KJ/mol) for a reaction if its rate constant doubles when the temperature is raised from 300 K to 400 K ? (R=8.314 J mol1 K1)(R = 8.314 \text{ J mol}^{-1} \text{ K}^{-1})

A

68.868.8

B

6.886.88

C

34.434.4

D

3.443.44

Correct Answer

Option A

Detailed Explanation

The statement is correct because when sparingly soluble salts dissolve in H₂O, they dissociate into ions, increasing the number of particles in solution. This increase in particle number leads to a higher entropy (ΔS) due to the greater randomness and disorder associated with the dissolved ions compared to the solid state. Other options are not applicable as they do not provide alternative explanations or relevant information regarding the entropy change associated with the dissolution process. Understanding the relationship between solubility, ion dissociation, and entropy is crucial in thermodynamics and solution chemistry.

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