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Question

For H2O and H2S given -

Compound Hybridisation of Hybridisation bond angle
H2O O sp3 104.50
H2S S sp3 92.10
Difference in bond angle is due to-

A
The larger size of S atom as compared to O atom which decreases the orbital overlap and hence the hybridization tends to be purely p orbitals.
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B
Liquid state of H2O as compared to gaseous state of H2S
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C
Both of the above
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D
None of the above
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Solution

The correct option is A The larger size of S atom as compared to O atom which decreases the orbital overlap and hence the hybridization tends to be purely p orbitals.
There are 3 types of repulsion- (lp-lp), (lp-bp), (bp-bp) thus bond angle in H2O < 109.5 i.e. 104.5 and in H2S 90. It is due to larger size of S atom which minimises the repulsion and allows the bonds in H2S to be purely p-type.

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