Following data is given for the reaction: CaCO3(s)⇌CaO(s)+CO2(g) ΔfHo[CaO(s)]=−635.1kJ mol−1 ΔfHo[CO2(g)]=−393.5kJ mol−1 ΔfHo[CaCO3(s)]=−1206.9kJ mol−1
Predict the effect of temperature on the equilibrium constant of the above reaction.
A
On increasing temperature, equilibrium will shift in forward direction
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B
On increasing temperature, equilibrium will shift in backward direction
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C
Equilibrium will remain unchanged on decreasing the temperature
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D
Equilibrium will remain unchanged on increasing the temperature
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Solution
The correct option is A On increasing temperature, equilibrium will shift in forward direction ΔfHo=ΔfHo[CaO(s)]+ΔfHo[CO2(g)]−ΔfHo[CaCO3(s)] ∴ΔrHo=178.3kJ mol−1
The reaction is endothermic. Hence, according to Le Chatlier's principle, reaction will proceed in forward direction on increasing temperature.