Which of the following name formula combinations is not correct?

• A

  $\mathrm{K}_2\left[\mathrm{Pt}(\mathrm{CN})_4\right]$ - Potassium tetracyanoplatinate (II)
• Correct answer
  B

  $\left[\mathrm{Mn}(\mathrm{CN})_5\right]^{2-}$ - Pentacyanomagnate (II) ion
• C

  $\mathrm{K}\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_4\right]$ - Potassium diammine tetrachlorochromate (III)
• D

  $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_4\left(\mathrm{H}_2 \mathrm{O}\right) \mathrm{I}\right] \mathrm{SO}_4$ - Magnetron value.

Hence, the correct answer is option: 'B'.