You didn't give an answer choice there, but I believe the answer is Hydrobromic Acid. Strong Acids are considered to ionize.
Assuming that the solution is simply an aqueous solution
so that it is purely made of NaClO4 (the solute) and water (the solvent), then
I believe the dissolved species would only be the ions of NaClO4, these are:
Na+
ClO4 -
Eh I can't comment
That's y
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Double replacement because H and K are both switching