Question

At room temperature hcl is gas while hf is a low boiling liquid this is because

Answer 1

Because compare fluorine chlorine has more electro negativityand it has very small size. But it has lower election affinity compared to that of chlorine because due to its very small size of f atom the incoming e experiences a strong repulsion e so the in coming e is added with difficulty.

However due to large size of chlorine Alton the incoming e experiences very less repulsion b/w the 7 non-bonding e and incoming e consequently the e gain enthalpisis of f is less negative than that of cl