The primary and secondary valencies of cobalt respectively in [Co (...

The primary and secondary valencies of cobalt respectively in

\left[Co ( {NH}_{3}{)}_{5}Cl\right]{Cl}_{2}

are:

Options

A3 and 5
B2 and 6
C2 and 8
D3 and 6

Correct answer

D. 3 and 6

Step-by-step solution

$\left[Co ( {NH}_{3}{)}_{5}Cl\right]{Cl}_{2}$

The primary valency is the ionisable valency. Oxidation number of $Co$ is $+ 3$ . So, primary valency is $3$ . Secondary valency refers the coordination number. It is an octahedral complex so, secondary valency is 6.

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