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(B) reaction with a positive $\Delta H$ is an endothermic reaction. $1$. The formation of ammonia $(N_2 + 3H_2 	o 2NH_3)$ is an exothermic process $(

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$N_{2(g)} + O_{2(g)} 	o 2NO_{(g)}$

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(B) reaction with a positive $\Delta H$ is an endothermic reaction. $1$. The formation of ammonia $(N_2 + 3H_2 	o 2NH_3)$ is an exothermic process $(\Delta H $2$. The formation of nitric oxide $(N_2 + O_2 	o 2NO)$ requires high temperatures to proceed,as it is an endothermic reaction $(\Delta H > 0)$. $3$. The combustion of methane $(CH_4 + 2O_2 	o CO_2 + 2H_2O)$ is a highly exothermic process $(\Delta H $4$. The formation of water $(H_2 + 1/2O_2 	o H_2O)$ is an exothermic process $(\Delta H Therefore,the correct option is $B$.

For which of the following reactions will the value of $\Delta H$ be positive?

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