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JEE Advanced 2017Paper 2
Exam
JEE Advanced
Year
2017
Paper
Paper 2
Subject
Chemistry
Chapter
Thermodynamics (C)

JEE Advanced 2017 · Paper 2 · Chemistry · Thermodynamics (C)

For a reaction taking place in a container in equilibrium with its...

For a reaction taking place in a container in equilibrium with its surroundings, the effect of temperature on its equilibrium constant KK in terms of change in entropy is described by:

Options

  1. Awith increase in temperature, the value of KK for exothermic reaction decreases because the entropy change of the system is positive.
  2. Bwith increase in temperature, the value of KK for endothermic reaction increases because unfavourable change in entropy of the surroundings decreases.
  3. Cwith increase in temperature, the value of KK for exothermic reaction decreases because favourable change in entropy of the surroundings decreases.
  4. Dwith increase in temperature, the value of KK for endothermic reaction increases because the entropy change of the system is negative.

Correct answer

B. with increase in temperature, the value of KK for endothermic reaction increases because unfavourable change in entropy of the surroundings decreases.

Step-by-step solution

ΔSsurrounding=−qprocessTsurrounding{\Delta S}_{surrounding} = \dfrac{- {q}_{process}}{{T}_{surrounding}}

If ΔH>0\Delta H > 0, on increasing temperature, Kequilibrium{K}_{equilibrium} also increase, so ΔSsurrounding<0{\Delta S}_{surrounding} < 0 (Surrounding is unfavourable).

If ΔH<0\Delta H < 0, on increasing temperature Kequilibrium{K}_{equilibrium}, decreases, so ΔSsurrounding>0{\Delta S}_{surrounding} > 0 (Surrounding is favourable).

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