In a Victor Meyer's apparatus,$510 \ mg$ of a liquid on vaporization displaces $67.2 \ cm^3$ of dry air at $NTP$. What is the molecular weight of the liquid?

Sulfur reacts with chlorine to form $S_2Cl_2$ and $SCl_2$. The equivalent mass of sulfur in $SCl_2$ is ................. $g/mol$.

$74.5 \ g$ of a metallic chloride contains $35.5 \ g$ of chlorine. The equivalent mass of the metal is

The oxide of a metal contains $40 \%$ of oxygen. The valency of the metal is $2$. What is the atomic weight of the metal?

$A$ gas has the formula $(CO)_x$. Its vapour density is $70$. What is the value of $x$?

Elements $X$ and $Y$ form compounds $X_2Y_3$ and $X_3Y_4$ respectively. If $0.2 \ mol$ of $X_2Y_3$ weighs $32.0 \ g$ and $0.4 \ mol$ of $X_3Y_4$ weighs $92.8 \ g$,then the atomic masses of $X$ and $Y$ are respectively: