$A$ metal oxide contains $32\%$ oxygen by mass. Its equivalent mass is:

Suppose the elements $X$ and $Y$ combine to form two compounds $XY_2$ and $X_3Y_2.$ When $0.1 \ mol$ of $XY_2$ weighs $10 \ g$ and $0.05 \ mol$ of $X_3Y_2$ weighs $9 \ g,$ the atomic weights of $X$ and $Y$ are

$x_1 \, g$ of a compound combines with $O_2$ to give $x_2 \, g$ of oxide. The equivalent mass of the compound is .........

The equivalent weight of $K_2Cr_2O_7$ in acidic medium is:

The atomic mass of a metal is $27$ and its equivalent mass is $9$. What is the formula of its chloride?

The atomic weight of $Ne$ is $20.2$. It is a mixture of $Ne^{20}$ and $Ne^{22}$. What is the relative abundance of the heavier isotope (in $\%$)?