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Question

The shape of water molecule which should be tetrahedral has a bent or distorted tetrahedral shape with a bond angle 104.5o. What could be the reason for this?

A
lp-lp repulsion is more than lp-bp repulsion
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B
lp-bp repulsion is more than lp-lp repulsion
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C
lp-lp repulsion is equal to lp-bp repulsion
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D
Presence of lone pair does not affect the bond angle
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Solution

The correct option is A lp-lp repulsion is more than lp-bp repulsion
The lone pair of electrons in the oxygen atom is not bonded to any atoms so they are free to repel each other.
These repulsive forces act to push the hydrogen atoms closer together and create a compression angle of 1045,
Due to the special bent shape of the water molecule, this causes the water molecules to build crystal structure when water freezes. Hence water has a unique nature of expanding when it freezes.
so the correct option is [A]

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