One of the following is an endothermic reaction. This is:(a) combination of carbon and oxygen to form carbon monoxide(b) combination of nitrogen and oxygen to form nitrogen monoxide(c) combination of glucose and oxygen to form carbon dioxide and water(d) combination of zinc and hydrochloric acid to form zinc chloride and hydrogen
Correct Answer: (b) combination of nitrogen and oxygen to form nitrogen monoxide.
Explanation: nitrogen and oxygen are heated at a very high temperature of about 3,000oC to form nitrogen monoxide. Hence, it is an endothermic reaction.
$N_{2} \ ( g) \ +\ O_{2} \ ( g) \ \xrightarrow{3000\ C} \ 2NO\ ( g)$
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