Why the bond angle of hydrogen sulphide is 92 degrees?

Answer 1

I assume you have come across VSEPR theory.

The central sulphur atom has 4 pairs of electrons around it (two pairs in the covalent bonds between S and H and two lone pairs that are sometimes drawn as rabbits ears!) If these four pairs repelled each other equally would form a tetrahedral angle of about 1090 ,this is the angle found in methane wheer the four pairs are identical and repel one another equally.

In H2S the two lone pairs repel more strongly and this pushes the hydrogen atoms closer together reducing the bond angle to 920

Answer 2

The bond angle in hydrogen sulfide (H2S) is 92 degrees due to the repulsion between the lone pairs of electrons on the sulfur atom. These lone pairs occupy more space and push the hydrogen atoms closer together, resulting in a smaller bond angle compared to the ideal tetrahedral angle of 109.5 degrees.