(a) Define a combination reaction.(b) Give one example of a combination reaction which is also exothermic.(c) Give one example of a combination reaction which is also endothermic.

Academic Chemistry NCERT Class 10

(a) Combination reaction: The reactions in which two or more substances combine to form a single substance is called a combination reaction.

It is represented as X+ Y → XY.

(b) The reactions in which heat is released is known as an exothermic reaction:

Example: Carbon combines with oxygen to give carbon dioxide, heat energy is released during the process.

$C\ ( s) \ +\ O_{2} \ ( g) \ \rightarrow \ CO_{2} \ +\ Heat$

(c) The reactions in which heat is absorbed is known as an endothermic reaction:

Example: Nitrogen combines with oxygen to give nitric oxide, heat is required for this reaction to occur.

$N_{2} \ ( g) \ +\ O_{2} \ ( g) \ \xrightarrow{Heat} \ 2NO\ ( g)$

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Updated on: 10-Oct-2022

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