Concept:An acid that forms normal salt only must have no extra replaceable hydrogen atoms left after salt formation.
Explanation:A normal salt is formed when all the replaceable hydrogen atoms of an acid are completely replaced by metal ions.
Acids with more than one replaceable hydrogen, such as
H2SO4 and
H3PO4, can also form acidic salts.
Trioxonitrate(V) acid,
HNO3, contains only one replaceable hydrogen atom.
So it can form only normal salts, like
NaNO3 or
KNO3, and cannot form acid salts.
The other acids listed are dibasic or tribasic, so they can form both normal and acid salts.
Answer:B. Trioxonitrate(V) acid