Hello!
(Missing)
a) [A-] >[H+]
b) pH=0
c) [H+] = 1.0 M
d) [HA] = 1.0 M
The statement that is true regarding a 1,0 M solution of a strong acid HA is [H⁺]=1,0 M.
The chemical equation for the dissociation of the strong acid HA is the following
HA(aq) → H⁺(aq) + A⁻(aq)
If the acid is a strong acid, this reaction is complete, and the concentration of each ion is the same as the concentration of the strong acid, so if the acid concentration is 1,0 M, the H⁺ concentration would be 1,0 M as well.
Have a nice day!