Which of the following name is impossible ?

Potassium tetrafluoridooxidochromate (VI)

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Barium tetrafluoridobromate (III)

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Dichlorobis (urea) copper (II)

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All are impossible

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Solution

The correct option is A Potassium tetrafluoridooxidochromate (VI)
(A) In Potassium tetrafluoridooxidochromate (VI) $[\begin{matrix} V I & - 4 & - 2 C r & F_{4} & O \end{matrix}]$ is a neutral molecule so there should not be potassium cation.

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The formula of di-chlorobis(urea) copper(II) is

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