Which is not correctly matched?

Which is not correctly matched?

  1. A

    Oxidation number of nitrogen in NH3 is -3

  2. B

    Oxidation number of Mg in MgF2 is +2

  3. C

    Oxidation number of nitrogen in N2O5 is +5

  4. D

    Oxidation number of K in K2O is +2

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    Solution:

    Oxidation number of O is -2, so oxidation number of K has to be +1.

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