First slide

Werner's theory

Question

According to werner theory primary, secondary and duel valency of central atom in $[Co {({NH}_{3})}_{4} {Cl}_{2}] Cl$ Complex respectively

Moderate

A

3,4 and 5
B

0,6 and 3
C

6,3 and 0
D

3,6 and 2

Solution

3Cl^- satisfies primary valency, 6NH₃satisfies secondary valency and the ligand satisfy primary and secondary valency is called duel valency, that means ligand involved in calculation of primary and secondary valency. Hence 2Cl^- ligand acts as primary and secondary valency in given complex $[Co {({NH}_{3})}_{4} {Cl}_{2}] Cl$ , so duel valency of $[Co {({NH}_{3})}_{5} Cl] {Cl}_{2}$ Complex is 2

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