Which of the following is an endothermic reaction?
A
2H2(g)+O2(g)→2H2O(l)
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B
N2(g)+O2(g)→2NO(g)
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C
NaOH(aq.)+HCl(aq.)→NaCl(aq.)+H2O(l)
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D
C2H5(aq.)+3O2(g)→2CO2(g)+3H2O(l)
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Solution
The correct option is BN2(g)+O2(g)→2NO(g) N2(g)+O2(g)→2NO(g) is an endothermic reaction because heat is absorbed in this reaction. All the other reactions are exothermic as the heat is released during the process.