1. Tardigrade
  2. Question
  3. Chemistry
  4. In how many of the following, the oxidation number of cobalt is +3 ? i. Na 3[ Co ( NO 2)6] ii. [ Co ( NH 3)6] Cl 3 iii. [ Co ( en )2 Cl 2]+ iii. [ Co ( H 2 O )6]2+ v. [ CoCl 4]2- vi. [ Co ( CN )6]3-

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Q. In how many of the following, the oxidation number of cobalt is $+3$ ?
i. $Na _{3}\left[ Co \left( NO _{2}\right)_{6}\right]$
ii. $\left[ Co \left( NH _{3}\right)_{6}\right] Cl _{3}$
iii. $\left[ Co ( en )_{2} Cl _{2}\right]^{+}$
iii. $\left[ Co \left( H _{2} O \right)_{6}\right]^{2+}$
v. $\left[ CoCl _{4}\right]^{2-}$
vi. $\left[ Co ( CN )_{6}\right]^{3-}$

Coordination Compounds

Solution:

In complexes $(i), (ii), (iii)$ and $(vi)$ oxidation number of cobalt is $+3$.