Question

why is bond angle in h2o larger than that in h2s

Answer 1

Hey

Here is answer

Bond angle is directly proportional to electronegativity of central atom.

as electronegativity of O is more than S so bond angle of H2O more than H2S.

Due to more electronegativity of oxygen electron cloud shift towards it and this lead to increase in b.p-b.p repulsion.