The bond lengths and bond angles in the ...

The bond lengths and bond angles in the molecules of methane, ammonia, and water are given below:

This variation in bond angle is a result of
(i) the increasing repulsion between H atoms as the bond length decreases
(ii) the number of nonbonding electron pairs in the molecule
(iii) a nonbonding electron pair having a greater repulsive force than a bonding electron pair

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