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Although geometries of NH(3) and H(2)O m...

Although geometries of `NH_(3) and H_(2)O` molecules are distorted tetrahedral, bond angle in water is less than that of ammonia. Discuss.

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The difference in the bond angles of water `(H_(2)O)` and ammonia `(NH_(3))` is due to difference in the number of lone pairs and bond pairs in these two species. In `NH_(3)`, N has 1 lone pair and 3 bond pairs while in `H_(2)O,` O and 2 lone pairs and 2 bond pairs. the lone pair-bond pairr repulsion in `H_(2)O` is much more than those in `NH_(3)`. hence, bond angle around the central atom in `H_(2)O` is relatively smaler than that in `NH_(3)`.
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Knowledge Check

  • Which of the following molecule have a bond angle smaller than tetrahedral angle-

    A
    `NH_(4)^(+)`
    B
    `SiH_(4)`
    C
    `NH_(3)`
    D
    `H_(2)O`

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