Which are of the following is an exothermic reaction?

Options

A. `N_(2(g)) + 3H_(2(g)) - 92KJ rarr 2NH_(3(g))`
B. `N_(2(g)) + O_(2(g)) + 180.8 KJ rarr 2NO_((g))`
C. `H_(2(g)) + Cl_(2(g)) rarr 2HCl_(g)) rarr 2HCl_((g)), Delta H = - 184.6KJ`
D. `C_(("graphite")) + 2H_(2(s)) rarr CH_(4(g)) + 74.8kJ`

Answer

B

Explanation

`A + Delta H rarr B`
`Delta H gt 0 rArr` endothermic, `Delta H lt 0 rArr` exothermic