In which of the following reactions, the formation of product is favoured by decrease in temperature? (1) N2(g)+O2(g)→2NO(g)ΔH=181 (2) 2CO2(g)→2CO(g)+O2(g);ΔH=566 (3) H2(g)+I2(g)→2HI(g);ΔH=−94 (4) H2(g)+F2(g)→2HF(g);ΔH=−541
A
1,2
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B
2 only
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C
1,2,3
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D
3,4
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Solution
The correct option is D 3,4
Solution:- (D) 3,4
For an exothermic reaction, decrease in temperature increases Kc forward reaction and thus formation of product is favoured.