Pure hydrogen is obtained by carrying out the electrolysis of:

Why does hydrogen occur in a diatomic form rather than in a monoatomic form under normal conditions?

When steam is passed over red hot iron,the substances formed are

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Loss of electron from hydrogen atom results in a nucleus of $\sim 1.5 \times 10^{-3} \ pm$ size.
Reason $(R)$: Proton $(H^+)$ always exists in combined form.
In the light of the above statements,choose the most appropriate answer from the options given below:

The ionization of a hydrogen atom gives rise to:

Hydrogen has three isotopes: protium $(^{1}H)$,deuterium ($^{2}H$ or $D$),and tritium ($^{3}H$ or $T$). They have nearly same chemical properties but different physical properties. They differ in......