Verified Answer :

PhyCS

The answer is (4) K+ and HSO4- ions, because the two radical ions bond to create KHSO4. 

It also makes sense chemically speaking, because KH+ and SO4^2- cannot create a non-charged molecule, and naturally speaking all compounds that are not ions want to balance out their charges.

In an ionic compound, we have a reaction between a negative and a positive atom. 

Therefore, we automatically can conclude that our answer is (4) K+ and HSO4- ions
Hope I helped. :)

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