Consider the following reactions. In which cases is product formation favoured by decreased temperature? (1) N2(g)+O2(g)⇌2NO(g); ΔH∘=181kJ (2) 2CO2(g)⇌2CO(g)+O2(g); ΔH∘=566kJ (3) H2(g)+Cl2(g)⇌2HCl(g); ΔH∘=−9.4kJ (4) H2(g)+F2(g)⇌2HF(g); ΔH∘=−541kJ

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1,2

2 only

1,2,3

3, 4

answer is D.

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Detailed Solution

For exothermic reactions on decreasing temperature equilibrium shifts in forward direction

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