Q. The simplest formula of a compound containing 50% of element $X$ (at. wt 10) and 50% of element $Y$ (at. wt. 20) is
A) $XY$
B) $XY_{2}$
C) $X_{2}Y$
D) $X_{2}Y_{2}$
Explanation
(c)
Atom At mass $\mathbf{(a)}$ $\mathbf{\%\ (b)}$ $\frac{\mathbf{b}}{\mathbf{a}}$ Ratio
$X$ 10 50 $\frac{50}{10} = 5$ 2
$Y$ 20 50 $\frac{50}{20} = 2.5$ 1
Hence, empirical formula $= X_{2}Y$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.