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Idea of Hybridisation

Why does a mo...

Question

Why does a molecule of water shows $104^{o} 30^{'}$ bond angle and ${C H}_{4}$ has $109^{o} 28^{'}$ , although both of them show ${s p}^{3}$ hybridization?

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Solution

A molecule of water contains 2 lone pairs of the electron which repel each other while methane does not contain any lone pair of electrons.
$l p - l p$ repulsion occur in case of $H_{2} O$ due to which bond angle decreases.
$B o n d a n g l e α \frac{1}{N o . o f l p}$
$l p =$ lone pairs.

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Why CH4 has bond angle109 degree and 28minutes and ammonia a bond angle of 107degrees and water a bond angle of 104.5degree

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