MCQ
According to Werner's theory of coordination compounds:
- APrimary valency is ionisable.
- BSecondary valency is ionisable.
- CPrimary and secondary valencies are ionisable.
- DNeither primary nor secondary valency is ionisable.
✓
Answer
- Primary valency is ionisable.
Explanation:
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 [Cu(NH3)4]SO4 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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