Differentiate between primary and secondary valencies?

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Solution

Primary valency Secondary valency
Primary valency is equal to the Oxidation number of central ion. Secondary valency is equal to the coordination number of central metal ion.
It is non directional It is directional
It is ionisable It is non ionisable

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Difference between primary and daughters secondary valency

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Primary valency	Secondary valency
Primary valency is equal to the Oxidation number of central ion.	Secondary valency is equal to the coordination number of central metal ion.
It is non directional	It is directional
It is ionisable	It is non ionisable