State the type of reactions each of the following represent and balance the ones that are not balanced.
(c) $2 H g O \to 2 H g + O_{2}$

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Solution

$2 H g O \to 2 H g + O_{2}$
In this reaction mercuric oxide when heated it decomposes into two elements i.e., mercury and oxygen.
This an example of thermal decomposition reaction.
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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2 H g O \to 2 H g + O_{2}

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