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What is the maximum covalency of oxygen ...

What is the maximum covalency of oxygen ? Give examples.

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Oxygen usually forms two bonds. Its valency cannot be expanded due to lack to lack of valence d - orbitals. However, the maximum covalency of oxygen is three, due to an additional dative bond formed by oxygen using one of its lone pairs.
Hydronium ion, `H_(3)O^(+)` has two covalent bonds and one coordinate covalent bond formed by oxygen atom. Oxonium ion, `(C_(2)H_(5))_(2)OH^(+)` also has three bonds formed by oxygen.
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Knowledge Check

  • The maximum covalency of nitrogen is

    A
    2
    B
    3
    C
    4
    D
    5

  • The maximum covalency of nitrogen is

    A
    2
    B
    3
    C
    4
    D
    5

  • (A): Water forms hydronium ion in acid solutions (R): The maximum covalency of oxygen is three

    A
    Both A & R are true, R is the correct explanation of A
    B
    Both A & R are true, R is not correct explanation of A
    C
    A is true, R is false
    D
    A is false, R is true

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