Statement I: HF2 – ions exist in the solid & liquid state but HCl2 – ions do not exist.
Statement II: Fluorine forms hydrogen bond but chlorine can not.
Due to intermolecular H-bonding in between HF molecules, HF2- can exist.
But no such H-bonding is possible between HCl molecules due to larger size of Chlorine atoms.
I and II are true