Why is the bond angle of water less than the bond angle of `CH_(4)`?

The bond angle in water is.

Why is the bond angle in H_(2)S less than that in H_(2)O ?

The bond angle in water molecule is

What is the bond angle and shape of water?

The H-C-H bond angle in CH_(4) is

Why are the bond angles of NH_3 and H_2O less than the normal values of regular tetrahedron bond angles in spite of being sp^3 hybridised?

Explain why bond angle of NH_(3) is greater than NF_(3) while bond angle of PH _(3) is less than that of PF _(3),

Explain why bond angle of NH_(3) is greater than NF_(3) while bond angle of PH _(3) is less than that of PF _(3),

Why is the H-O-H bond angle in H_(2)O smaller than H-N-H bond angle in NH_(3) ?

In both alcohols and ethers , oxygen is sp^(3) - hybridised and has two lone pairs . However the R-O-H bond angle to alcohols is less than tetrahedral angle of 109^(@)28and the R-O-R bond angle to ethers is more than the tetrahedral angle of 109^(@)28 , Explain why ?