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Question

Consider the molecules CH4,NH3 and H2O. Which of the given statements is false?

A
The HCH bond angles in CH4, the HNH bond angle in NH3, and the HOH bond angle in H2O are all greater than 90
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B
The HOH bond angle in H2O is larger than the HCH bond angle in CH4
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C
The HOH bond angle in H2O is smaller than the HNH bond angle in NH3
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D
The HCH bond angle in CH4 is larger than the HNH bond angle in NH3
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Solution

The correct option is C The HOH bond angle in H2O is larger than the HCH bond angle in CH4
All the three molecules are sp3 hybridised but the bond angles are different due to the presence of lone pair. The bond angle of H2O is 104.5o due to bond pair - lone pair repulsion and the bond angle of CH4 is 109.25o.

Hence, option B is a false statement.

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