Which of the following solutions has a [H3O+] > [OH-]?
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That means they are asking you which of the following is more acidic than basic.
H2O cannot be, because it can be neutral, a pH 7, meaning equal amounts of H3O and OH are there.
NaOH when dissociates forms Na+ and -OH, that is forms a basic solution, with -OH greater than H3O.
NaCl is considered to be a neutral salt, that is , when it dissociates, in forms pH7, which is equally balanced between acid and base.
Therefore, the answer relies on HCLO4, Hyperchloric acid, which when dissciates forms H+ and ClO4-, both of these ions are highly concentrated with H+ rather than -OH.
Hope it helped.