Multiple choice

Which of the following is the correct molecular structure of the given coordination compound?

Potassium tetracyanidonickelate(II)

  1. K₂[Ni(CN)₄]

  2. K[Ni(CN)₄]

  3. K₂[Ni(CN)₄] ² +

  4. K[Ni(CN)₄] ² +
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A Correct answer
Explanation

Potassium tetracyanidonickelate(II) consists of the potassium cation (K+) and the complex anion [Ni(CN)4]2-. To balance the charges, two potassium ions are required.

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