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Chhattisgarh PMT Chhattisgarh PMT Solved Paper-2008

  • question_answer
    \[H-O-H\] bond angle in \[{{H}_{2}}O\] is \[{{104.5}^{o}}\] and not \[{{109}^{o}}28'\]because of

    A)  lone pair-lone pair repulsion

    B)  lone pair-bond pair repulsion

    C)  bond pair-bond pair repulsion

    D)  high electronegativity of oxygen

    Correct Answer: A

    Solution :

    The hybridisation of oxygen in water molecule is\[s{{p}^{3}}\]. So, water molecule must be tetrahedral and have bond angle\[{{109}^{o}}28'\]. But due to the presence of two lone pair of electrons on oxygen atom (repulsion between lone pair-lone pair) the bond angle decreases about \[{{104.5}^{o}}\] and the geometry becomes distorted tetrahedral or V-shaped.


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