Very pure hydrogen $(99.9\%)$ can be made by which of the following processes?

Which compound is formed on catalytic hydrogenation of carbon monoxide at high $p$ and high $T$ in the presence of $ZnO-Cr_2O_3$ catalyst?

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

Write the names of isotopes of hydrogen. What is the mass ratio of these isotopes?

$NaH$ is an example of:

Which of the following statements is not correct?