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Simplest formula of the compound containing 50% of element X (atomic mass 10) and 50% of element Y(atomic mass 20) is ___?

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$X_{2} Y$

${XY}_{2}$

$X_{2} Y_{3}$

answer is B.

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Detailed Solution

$\begin{array}{l} X = 50 %; & \frac{50}{10} = 5 mol \\ Y = 50 % & ; \frac{50}{20} = 2.5 mol \\ X : Y \\ 2 : 1 \\ E F = X_{2} Y \end{array}$

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