Pure hydrogen is obtained by carrying out the electrolysis of:

Which of the following is an industrial fuel?

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:

What is obtained by the reaction of $HCOOH$ with concentrated $H_2SO_4$?

Which property of hydrogen distinguishes it from alkali metals?