The maximum sum of the number of neutrons and protons in an isotope of hydrogen is

Consider the following statements and identify which of them are correct:
$I.$ Atomic hydrogen is obtained by applying an electric arc to hydrogen gas.
$II.$ Hydrogen gas does not reduce heated aluminum.
$III.$ Finely divided palladium absorbs a large volume of hydrogen gas.
$IV.$ The reaction of $Na$ with $C_2H_5OH$ yields pure nascent hydrogen.

Match the correct option from Column $-A$ and Column $-B$.

Column $-A$	Column $-B$
$(1)$. $VH$	$(a)$. Ionic hydride
$(2)$. $HF$	$(b)$. Metallic hydride
$(3)$. $MgH_2$	$(c)$. Electron precise hydride
$(4)$. $B_2H_6$	$(d)$. Molecular hydride

Which isotope of hydrogen emits a $\beta-$particle?

How can the production of dihydrogen,obtained from 'coal gasification',be increased?

Pick the odd one out regarding the properties of sodium borohydride $(NaBH_4)$.