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Question

The primary valence of the metal ion is satisfied by :


A
neutral molecules
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B
positive ions
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C
negative ions
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D
all
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Solution

The correct option is C negative ions
The primary or principal valency; this is the ionisable valency.

A metal always gives electron and becomes positively charged that can be neutralized by bonding with negative ion only. In a coordination compound, the number of negative ions needed to satisfy the charge on the central metal ion is it's primary valency.

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