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Q.

Which of the following is an exothermic reaction ?

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a

C(graphite) +2S(g)+91.9KJ→ CS2(l)

b

H2(g)+Cl2(g)→ 2HCl(g); ∆H = –184.6KJ

c

C(graphite) + H2O(g)→  CO2+H2(g) – 131.4KJ

d

N2(g)+O2(g)→ 2NO(g); ∆H = + 180.8KJ

answer is A.

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Detailed Solution

Thermochemical reaction in which 

(I) ∆H = -ve

(II) +q appears on product side

(III)-q appears on reactant side 

is exothermic reaction

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