Chemistry - Liquid Solution Question with Solution | TestHub

Two elements $A$ and $B$ form compounds of formula $A{B}_2$ and $A{B}_4$. When dissolved in $20.0\mathrm{g}$ of benzene $1.0\mathrm{g}$ of $A{B}_2$ lowers f. pt. by $2.3^{\circ }\mathrm{C}$ whereas $1.0\mathrm{g}$ of $A{B}_4$ lowers $\mathrm{f}$. pt. by $1.3^{\circ }\mathrm{C}$. The $K_f$ for benzene is 5.1. The atomic masses of $A$ and $B$ are