The oxidation number of cobalt in [Co(en)2H2O(CN)]2+:
Correct answer: B. 3
- A. 2
- B. 3
- C. 4
- D. 5
Explanation
The charge on EN is 0. The charge on the water is 0, the charge on CN is -1, and the charge on the complex is +2. For the central atom, consider that the oxidation number of Co is x. Therefore, the oxidation number of Co is +3.
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About Electronic Structure of d-Block Elements
The electronic structure of d-block elements covers the filling of the (n-1)d and ns orbitals, general electronic configurations, and the exceptions shown by chromium and copper. It explains how partially filled d orbitals produce variable oxidation states, coloured ions, magnetic behaviour and complex formation, while distinguishing transition elements from elements with completely filled d subshells.
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