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Q.

For the reaction, at 298 K
CaCO3(s)CaO(s)+CO2(g)ΔH=178.3kJ , ΔS=160JK1
 

Select the correct statement(s).

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a

The reaction is spontaneous at temperature 298 K

b

If temperature is decreased forward reaction is favoured

c

The reaction is spontaneous in forward direction only at temperature above 1114 K

d

The reaction is spontaneous in forward direction only at temperature above 1000 K

answer is D.

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Detailed Solution

G =H -TS          =178.3×1000 -T (160) For a spontanious process G =-ve T sholuld be greater than 1114

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For the reaction, at 298 KCaCO3(s)⟶CaO(s)+CO2(g)ΔH∘=178.3kJ , ΔS∘=160JK−1 Select the correct statement(s).