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Which of the following is an exothemic reaction ?

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N_2(g) + O_2(g) + 180.8k.J $\overset{}{\to}$ 2NO_(g)

N_2(g) + 3H_2(g) – 92k.J $\overset{}{\to}$ 2NH_3(g)

C_(graphite)+ H₂O_(g) $\overset{}{\to}$ CO_(g) + H_2(g) – 131.3kJ

C_(graphite)+ 2S_(s) $\overset{}{\to}$ CS_2(l) – 91.9k.J

answer is B.

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Detailed Solution

$∆ H = \sum {BE}_{Reactant} - \sum {BE}_{product}$

${BE}_{Reactant} > {BE}_{product}$ ; $∆ H = - ve$ and reaction is exothermic

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