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Question

Co-ordination compounds contain central metal atom/ion and ligands.


Primary valency of central metal atom/ion in [Co(NH3)6]Cl3 is :

A
3
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B
6
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C
4
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D
9
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Solution

The correct option is A 3

Primary valencies are those which a metal posses in the formation of its simple salts and it corresponds to its oxidation state. The primary valency of the metal ion is generally satisfied by a negative ion.

Here in this compound, negative ions are Cl ions. There are 3 Cl ions, so primary valency is 3.

Hence option A is correct.

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