Question

which one has the minimum bond angle h2o h2s nh3 nf3

Answer 1

Here is a site to read about this. This gives the method to use to answer your question although it contains CH4 which isn't a molecule in your question.
https://www.quora.com/Which-has-smallest-bond-angle-H2S-H2O-NH3-CH4
h2o h2s nh3 nf3
I believe H2O is about 105, H2S is about 92, NH3 is about 107 and NF3 is about 102