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Introduction to d and f Block Elements

A compound co...

Question

A compound consisting of two elements, $X$ and $Y$ has equal mass of them. If their atomic weights are $30$ and $20$ respectively, the molecular formula of that compound (Mol. wt. $= 120$ ) could be :

A

X_{2} Y_{2}

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B

X_{3} Y_{3}

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C

X_{2} Y_{3}

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D

X_{3} Y_{2}

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Solution

The correct option is C $X_{2} Y_{3}$
The molar ratio is given by,
$X$ : $Y$
$\frac{w}{30} : \frac{w}{20}$ $= 20 : 30 = 2 : 3$
The formula is $X_{2} Y_{3}$ .

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