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Question

Which of the following hydrides has the smallest H−X−H bond angle?

A
H2O
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B
H2S
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C
H2Se
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D
H2Te
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Solution

The correct option is C H2Te
HXH BondAngle HX Bond length
H2O 104o 96 pm
H2S 92o 134 pm
H2Se 91o 146 pm
H2Te 90o 169 pm
Bond angleelectronegativity (EN) of the central atom
as EN of O is maximum and EN of Te is minimum, the bond angle is maximum in case of H2O and minimum in case of H2Te

Due to more EN of Oxygen, electron cloud shifts towards it and thus leads to an increase in b.p-b.p repulsion. Tellurium exhibits minimum electronegativity, thus it possesses a minimum bond angle.

Hence, the correct option is D.

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