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Question

For the reaction,
AB2(g)+A(s)B2(g)+A2(g) following graph is obtained.

where, KEquilibrium Constant
TTemperature in Kelvin
Which of the following will increase the concentration of AB2 at equilibrium?

A
Adding more of A(s)
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B
Decreasing temperature
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C
Adding inert gas at constant volume
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D
Increasing the volume of container
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Solution

The correct option is B Decreasing temperature
We know,
lnK=ΔHRT+ΔSR
Here slope is negative.
ΔHR=ve
ΔH=+ve
Reaction is endothermic.
So, on decreasing temperature, reaction will shift backward and concentration of AB2 will increase.
On increasing volume, concentration of every species will decrease.
By adding more A(s), there will be no effect on equilibrium, as it is pure solid.
By adding inert gas at constant volume, total pressure will increase but there will be no effect on partial pressure.

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