Answer
See the answer below.
Work Step by Step
a) Valence electrons C: 4, H: 1, O: 6, N:5
Bicarbonate: $3×6+1+4+1=24$
Nitric acid: $1+5+3×6=24$
They are isoelectronic.
b) Two ressonance structures each, alternating the O= with the O- group.
c) The nitrogen in nitric acid has a formal charge of +1, the oxygen making a single bond only in both cases has a formal charge of -1, but due to ressonance, they have a -1/2 charge along with the one making a double bond.
d) It's harder to remove/easier to add a $H^+$ from/to a negatively charged anion like bicarbonate than nitric acid, therefore it's more acidic.
