The chemical formula of the oxide of an element X whose valency is 3 is:

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X_{2} O_{3}

{XO}_{3}

X_{2} O

X_{3} O

answer is A.

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Detailed Solution

The chemical formula of its oxide is

X_{2} O_{3}

. Valency is equal to the number of electrons gained, lost or shared by an atom of an element to achieve the nearest noble gas configuration. For example, the valency of sodium (Na) is 1, magnesium (Mg) is 2, and Chlorine (Cl) is 1The proportion of a component's joining limit with different particles when it forms structures, mixtures or atoms is defined as valency. X has valency 3, and oxide ion has valency 2. So, the formula of oxide will be

X_{2} O_{3}

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