What happens when an acid reacts with a metal oxide? Explain with the help of an example. Write a balanced equation for the reaction involved.

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Solution

An acid reacts with a metal oxide to produce salt and water. The equation can be written as:
$Metal oxide + Acid \to Salt + Water$

For example, copper $(I I)$ oxide $(C u O)$ is a metal oxide. Dilute hydrochloric $(H C l)$ acid reacts with copper $(I I)$ oxide to form copper $(I I)$ chloride $(C u C l_{2}, a salt)$ and water $(H_{2} O)$ . The balanced equation of this chemical reaction is:

$C u O (s) + 2 H C l (a q) ⟶ C u C l_{2} (s) + H_{2} O (l)$

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