The formula of a compound having its constituent as $X$ and $Y$ is $X_{2} Y_{3}$ . If the element will form its chloride then what will be the formula of the compound?

X₂Cl

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XCl₂

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X₃Cl

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XCl₃

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Solution

The correct option is D
XCl₃

By the formula $X_{2} Y_{3}$
$\begin{matrix} S y m b o l : & X & Y V a l e n c y : & 3 & 2 \end{matrix}$
The valency of X is 3.
So, its formula can be found out by cross-multiplication of the valencies-

The formula will be $X C l_{3}$

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