Question

how does HNO3 contains radicals of polyatomic group​

Answer 1

Answer:

Polyatomic ions are covalently-bonded atoms that have a charge.  Covalently-bonded atoms without a charge are called molecules, but if the atoms have not lost/gained the proper number of electrons to be neutral, they are akin to a "charged molecule." As such, they then will behave like a charged ion in an ionic bond (lattice structure).

Answer 2

Nitrates, inorganic, aqueous solution, n.o.s. is a liquid which is readily ignited when in contact with organic materials. It is noncombustible but will accelerate the burning of combustible materials.