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

Which one of the following substances is used in the laboratory for a fast drying of neutral gases?

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

Carbon monoxide is a neutral oxide of carbon,but it acts as a very strong field ligand and associates with metals to form complex compounds. These complex compounds are very useful and used in metallurgical processes. Water gas is a mixture of

The most dangerous method of preparing hydrogen would be by the action of $HCl$ and

Hydrogen gas will not reduce