Question

why HCL is gas and HF is liquid?​

Answer 1

Due to greater electronegativity of F over Cl, F forms stronger H-bonds as compared to Cl. As a result, more energy is needed to break the H-bonds in HF than in HCl and hence the b.p. of HF is higher than that of HCl. Consequently, H-F is liquid while HCl is a gas at room temperature.

Answer 2

Answer:

HF molecules are associated due to intermolecular hydrogen bonding.

Therefore HF is a liquid at room temperature. Since it is absent in the HCl molecules, it exits as a gas at room temperature

hope it helps