First slide

Sidgwick's theory

Question

Effective atomic number of central atom in $[Cr {(H_{2} O)}_{6}] {Cl}_{3}$ Complex is

Moderate

A

33
B

36
C

86
D

54

Solution

$[Cr {(H_{2} O)}_{6}] {Cl}_{3}$ For this,
EAN = Central atom, atomic number- Oxidation number + 2 X number of ligands
EAN = 24-3 +2 (6) =33

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