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Q.

The compound that has the largest H-M-H bond angle M = N, O, S, C) is

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a

H2S

b

CH4

c

NH3

d

H2O

answer is D.

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Detailed Solution

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[CH4 = hybridisation is sp3 , lone pair of electrons is 0, so that bond angle is maximum, i.e. = 109°28'

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NH3 = Hybridisation is sp3, lone pair of electron is one, so that bond angle is 107°

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H2O = Hybridisation is sp3 lone pair of electrons are two, so that bond angle is 104°5'

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No hybridisation as according to Draga's rule, so that bond angle is 92° 

According to VSEPR theory.
Lone pair-Lone pair > Lone pair-Bond pair > Bond pair-Bond pair.

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