The elements $N$,$P$,$As$,$Sb$,and $Bi$ belong to which group?

Phosphorus has three allotropic forms:
$(i)$ white phosphorus
$(ii)$ red phosphorus and
$(iii)$ black phosphorus.
Write the difference between white and red phosphorus on the basis of their structure and reactivity.

Which of the following is used as an anesthetic?

The element which is essential in nitrogen fixation is

Which oxide does not act as a reducing agent?

What is the chemical formula of hypophosphorus acid?