Question

give the reason for bond angle decreases from 109°28' to 104°31'.​

Answer 1

Explanation:

the bond angle decrease because due to the presence of two lone pairs

Answer 2

Explanation: The water decreases to 109°29'

Because the electronic configuration of Oxygen is O= 1s2 2s2 2p4

It has 2 unpair electrons and 2 lone pair electrons

So Lone pair - lone pair electrons occupies more space than bond pair - bond pair electrons

So Oxygen bond's with hydrogen and instead of linear it transforms into the v shape structure molecule and gets 109°29' bond angle