Give two examples of direct combination when two compounds are involved by writing chemical equations.

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Solution

Direct combination: The reaction in which two or more elements or compounds combine to form a single product is called direct combination reaction.
Two examples of direct combination when two compounds are involved are:
$CaO (s) + {CO}_{2} (g) \overset{}{\to} {CaCO}_{3} (s)$
$2 {NH}_{3} (g) + H_{2} {SO}_{4} (aq) \overset{}{\to} {({NH}_{4})}_{2} {SO}_{4} (aq)$

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