Final answer:
The correct set of chemical name and formula is ammonium sulfite, (NH4)2SO3.
Step-by-step explanation:
The correct set of chemical name and chemical formula for the same compound is:
a. ammonium sulfite, (NH4)2SO3
Out of the given options, option a is the correct set.
Ammonium sulfite is the correct chemical name for the compound and (NH4)2SO3 is the correct chemical formula for it.