alleryOxidation state of Co in [Co(NH3)5Cl]Cl2:
A+3
B+4
C+2
D+1
Answer & Solution
Correct answer: A. +3
Inner sphere [Co(NH3)5Cl]: NH3 neutral, Cl is -1. Outer Cl2 contributes -2 (two Cl⁻ as counter ions).
The whole compound is neutral, and [Co(NH3)5Cl]²⁺.
**So Co ox state:** +2 = x + 5(0) + (-1) → x = +3. Cobalt(III).
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