State the type of reactions each of the following represent and balance the ones that are not balanced.
(j) CaCO $_{3}$ $\to$ CaO + CO $_{2}$

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Solution

CaCO $_{3}$ $\to$ CaO + CO $_{2}$
In the given reaction, calcium carbonate undergoes decomposition to form calcium oxide and carbon dioxide.
A balanced equation should contain equal number of atoms on both the sides of the equation.
As the given equation contains equal number of atoms on both the sides of the equation, it is balanced.

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