Which of the following name formula combinations is not correct?

  1. A

    K2Pt(CN)4    Potassium tetracyanoplatinate(II)

  2. B

    Mn(CN)52    Pentacyanomagnate(II) ion

  3. C

    KCrNH32Cl4  Potassium diamminetetrachlorochromate(III)

  4. D

    CoNH34H2OISO4   Tetraammine aquaiodocobalt(III) sulphate

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    Solution:

    Mn(CN)52 is pentacyanomangnate(III) ion. The IUPAC name of the compound Mn(CN)52 is Pentacyanomanganate(III) ion as the oxidation number of manganese is +3.

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