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Question

2CaSO4(s)2CaO(s)+2SO2(g)+O2(g),ΔH>0
Above equilibrium is established by taking sufficient amount of CaSO4(s) in a closed container at 1600 K. Then which of the following may be correct option(s)?(Assume that solid CaSO4 is represent in the container in each case)

A
Moles of CaO(s) will increase with the increase in temperature.
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B
If the volume of the container is doubled at equilibrium then partial pressure of SO2(g) will change at new equilibrium.
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C
If the volume of the container is halved partial pressure of O2(g) at new equilibrium will remain same.
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D
If two moles of the He gas is added at constant pressure then the moles of CaO(s) will increase.
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Solution

The correct options are
A Moles of CaO(s) will increase with the increase in temperature.
C If the volume of the container is halved partial pressure of O2(g) at new equilibrium will remain same.
D If two moles of the He gas is added at constant pressure then the moles of CaO(s) will increase.
The given reaction is :-
2CaSO4(s)2CaO(s)+2SO2(g)+O2(g);H>0
The given reaction is endothermic reaction reaction as H>0, so after increasing the temperature, by Le Chatelier's principle, reaction will proceed in forward direction.
So, on increasing temperature moles of CaO will increase.
Now we have
Kp=pSO2
Ko is dependent only on temperature.
So Kp will remain constant even if volume of the container is halved .As a result partial pressure of SO2 at equilibrium remains same.
When the inert gas is added to the system at equilibrium at constant pressure then the volume increases so the reaction will shift itself toward backwards side in the direction of volume decreasing. It can be concluded as a result of Le chatelier's principle.

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