$1 \, g$ of hydrogen is found to combine with $80 \, g$ of bromine. $1 \, g$ of calcium (valency $2$) combines with $4 \, g$ of bromine. The equivalent weight of calcium is

An oxide of an element contains $20 \%$ oxygen by weight. Calculate the equivalent weight of the element.

The approximate atomic weight of an element is $26.89$. If its equivalent weight is $8.9$,the exact atomic weight of the element would be:

Sulfur forms two chlorides,$S_2Cl_2$ and $SCl_2$. The equivalent mass of sulfur in $SCl_2$ is $16$. What is the equivalent mass of sulfur in $S_2Cl_2$?

$4 \, g$ of copper is dissolved in concentrated $HNO_3$. Upon strong heating of the resulting copper nitrate solution,$5 \, g$ of its oxide is obtained. The equivalent weight of copper is ...... .

In order to prepare one litre of a $1 \ N$ (normal) solution of $KMnO_4$,how many grams of $KMnO_4$ are required if the solution is to be used in an acidic medium for oxidation?