Elements of which of the following group$(s)$ of the periodic table do not form hydrides?

Given below are two statements:
Assertion $(A)$: Protium and deuterium differ in their rates of reactions.
Reason $(R)$: They have different enthalpies of bond dissociation.
The correct answer is:

Which of the following is distilled first during the fractional distillation of liquid air or mixtures of these gases?

Hydrogen has a tendency to gain one electron to acquire the helium configuration. In this respect,it resembles:

Which of the following is an example of an interstitial hydride?

Tritium undergoes radioactive decay giving