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Question

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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