Question

A compound contains two elements ${}^{\prime }{X}^{\prime }$ and ${}^{\prime }{Y}^{\prime }$ in the ratio of Mass percentage of $50\%$ each. Atomic mass of ${}^{\prime }{X}^{\prime }$ is 20 and ${}^{\prime }{Y}^{\prime }$ is 40. What can be its simplest formula?

• A. $XY$
• B. $X_{2}Y$
• C. $X{Y}_2$
• D. $X_2{Y}_3$

Answer 1

The correct option is B $X_{2}Y$

$\text{Mass Percentage of element 'X'}=50,moleratio=\frac{50}{20}=2.5$
$\text{Mass Percentage of element 'Y'}=50,moleratio=\frac{50}{40}=1.25$
$\Rightarrow \text{For 'X' simple ratio}=2.5/1.25=2$
$\Rightarrow \text{For 'Y' simple ratio}=1.25/1.25=1$
$\Rightarrow \text{Formula}=X_{2}Y$.
Hence, Option $\left(b\right)$ is the correct answer