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Coordination Compounds — Chemistry STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceChemistryCoordination Compounds1 Mark
Question
According to Werner's theory of coordination compounds$:$
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Answer

Primary valency is ionisable according to Werner's theory of coordination compounds.
According to Werner's coordination theory, there are two kinds of valency, primary and secondary.
The primary valency of a central metal ion is satisfied with anions.
For example, in $\ce{[Cu(NH_3​)_4​]SO_4}$​ primary valency is $2$ and secondary valency is $4.$
Secondary valence refers to coordination number.
Since copper is coordinated to $4$ ammonia ligands, secondary valence is $4.$
Primary valence is satisfied by anions.
Since sulphate ion has $-2$ charge, primary valence is $2.$

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