First slide

Werner's theory

Question

The primary valence of the metal ion in the coordination compound $K_{2} [Ni {(CN)}_{4}]$ is

Moderate

A

Four
B

Zero
C

Two
D

Six

Solution

Primary valencies are also known as oxidation state.
K₂[Ni(CN)₄], 2 + x - 4 = 0 ⇒ x = + 2

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