Which of the following is true about sodium 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 $\%$)?

The equivalent weight of potassium permanganate $(KMnO_4)$ in an acidic solution is:

An enzyme peroxidase has $5\%$ by weight of sulphur $(S = 32)$. Its minimum molecular weight will be:

Chlorine exists in two isotopic forms $^{35}Cl$ and $^{37}Cl$. If the average atomic mass of chlorine is $35.5$,what is the percentage abundance of these isotopes respectively?

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