Q-1 Although geometries of NH3 and H20 are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.
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concept : the size of lone pair is larger than bond pair .it means more the number of lone pair of electrons , lesser the bond angle .

Here, In H2O molecule , there is one lone pair -lone pair repulsion because the presence of two lone pairs of electrons . while in NH3 molecule , there are only one lone pair - bond pair repulsion .

now, According to VSEPR theory ,

lp - bp is more stronger ( stable ) than lp - lp. so, the second one is more stronger .hence, bond angle of water is less than bond angle of ammonia.

in simple way, you can say that bond angle of H2O is lesser due to number of lone pair is more.

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