Question

Two compounds $X{Y}_2,X{Z}_4$ are given. The oxidation state of $Z$ is $1$. What will be the oxidation state of $Y$ and, write the molecular formula of the compound formed by $Y$ when it combines with aluminium $\left(Al\right)$ having oxidation state $+3$.

Answer 1

In $X{Z}_4$

$X+4Z=0$

$X=+4$

in $X{Y}_2$

$X+2Y=0$

$Y=-\frac{X}{2}$

$Y=-2$

and the molecular formula of the compound formed by Y when it combines with aluminium (Al) having oxidation state $+3.$ is $A{l}_2{Y}_3$