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Question

Consider the complex [Co(NH3)5Cl]ClO4. The co-ordination and oxidation number (magnitude only) on the metal are, respectively :

A
6 and 2
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B
6 and 4
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C
4 and 3
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D
4 and 2
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Solution

The correct option is A 6 and 2
There are 5 NH3 molecules and one Cl ion in the coordination complex. So, the coordination number is 6. The oxidation number of cobalt in the complex is +2. As, the overall charge on the complex ion is +1 and Cl has -1 charge. So, Co should have +2 charge to balance the overall charge.

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