Which gas is produced in the atmosphere due to lightning?

$H_3PO_2$ is the formula for one of the phosphorus acids. Its name and basicity are respectively:

Identify the correct set of $13^{th}$ group elements which do not form amphoteric oxides?

$A$ tetra-atomic molecule $(A)$ on reaction with nitrogen $(I)$ oxide,produces two substances $(B)$ and $(C).$ $(B)$ is a dehydrating agent in its monomeric form while substance $(C)$ is a diatomic gas which shows almost inert behaviour. The substances $(A)$,$(B)$,and $(C)$ respectively will be

How can you explain the higher stability of $BCl_3$ as compared to $TlCl_3$?

Why does $R_{3}P=O$ exist but $R_{3}N=O$ does not ($R=$ alkyl group)?