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In Werner's theory of coordination compounds, the *secondary valence* of a metal:
AIs ionisable and satisfied by negative ions
BIs non-ionisable, equals the coordination number, and is fixed for a metal — satisfied by neutral molecules or anions
CIs always equal to the primary valence
DIs the oxidation number
Answer & Solution
Correct answer: B. Is non-ionisable, equals the coordination number, and is fixed for a metal — satisfied by neutral molecules or anions
Werner: **primary valence = ionisable, equals oxidation number, satisfied by anions outside coord sphere**; **secondary valence = non-ionisable, equals coordination number, satisfied by ligands inside the square brackets**.
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