alleryWerner's coordination theory introduced primary and secondary valencies. Primary valency corresponds to:
AColor
BCoordination number
COxidation state of metal
DMagnetic moment
Answer & Solution
Correct answer: C. Oxidation state of metal
Primary valency = oxidation state of central metal (ionizable).
Secondary valency = coordination number (non-ionizable, fixed in space).
Alfred Werner's 1893 theory; Nobel Prize 1913.
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