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NTA Abhyas 2020
Exam
NTA Abhyas
Year
2020
Subject
Chemistry
Chapter
Chemical Equilibrium

NTA Abhyas 2020 · Chemistry · Chemical Equilibrium

Which of the following lines correctly show the temperature...

Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic reaction?

Which of the following lines correctly show the temperature dependence of equilibrium constant K, for an exothermic

Options

  1. AA and D
  2. BA and B
  3. CB and C
  4. DC and D

Correct answer

B. A and B

Step-by-step solution

ΔGo=−RTln K\Delta G^{o} = - RT\text{ln K}

ΔHo−TΔSo=−RTln K\Delta H^{o} - T\Delta S^{o} = - RT\text{ln K}

- \dfrac{{\text{\Delta H}^{o}}{\text{RT}} + \dfrac{{\text{\Delta S}^{o}}{R} = ln\text{K}

Therefore lnK vs1Tln \text{K vs}\dfrac{1}{T} graph will be a straight line with slope equal to −ΔHoR- \dfrac{\Delta H^{o}}{R}. Since reaction is exothermic, therefore ΔHo\Delta H^{o} itself will be negative resulting in positive slope.
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