Explore topic-wise InterviewSolutions in .

In H₂Te the size of Central Te is more than that of sulphur in H₂S and therefore, the distance between the central atom and hydrogenTe-H is more than that of S-H.As a result a large Bond length and bond dissociation enthalpy of,Te-H is less than that of S-H and bond cleavage of Te-H bond is easy therefore H₂Te is more acidic than H₂S.

Fluorine is highly electronegative and can easily cause the promotion of electrons from the filled to the vacant 3d orbitals however, Hydrogen is less electronegative, even less than that of sulphur therefore it cannot cause the promotion of electrons.Thus SF₆ is known but SH₆ is not known.