The approximate mass of a tritium oxide molecule is $............$ $amu$.

When an element forms its oxide,oxygen constitutes $20\%$ of its weight in the oxide. What is the equivalent weight of the element?

Assertion : The normality of $0.3 \ M$ aqueous solution of $H_3PO_3$ is equal to $0.6 \ N$.
Reason : Equivalent weight of $H_3PO_3 = \frac{\text{Molecular weight of } H_3PO_3}{3}$

$12 \ g$ of an element reacts with $32 \ g$ of oxygen. What is the equivalent weight of the element?

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

The equivalent mass of an element is $4$ and the vapor density of its chloride is $59.25$. Find the valency of the element.