The correct structure of the complex having IUPAC name sodium hexanitrocobaltate(III) is:
Show Hint
- \( Na_3 [Co(NO_2)_5] \)
- \( Na_4 [Co(NO_2)_6] \)
- \( Na_3 [Co(NO_2)_6] \)
\( Na_4 [Co(NO_2)_5] \)
The Correct Option is C
Solution and Explanation
The given IUPAC name is sodium hexanitrocobaltate(III).
- "Hexanitro-" refers to six \( NO_2 \) ligands.
- "Cobaltate" indicates the presence of a complex anion.
- The oxidation state of cobalt is (III), meaning \( Co^{3+} \).
- The charge of \( [Co(NO_2)_6]^{3-} \) requires three \( Na^+ \) ions for charge neutrality.
Thus, the correct formula is \( Na_3 [Co(NO_2)_6] \), making the correct answer (c).
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Werner’s coordination theory in 1893 was the first attempt to explain the bonding in coordination complexes. It must be remembered that this theory was put forward before the electron had been discovered by J.J. Thomson in 1897, and before the electronic theory of valency. Werner did not have any of the modern instrumental techniques and all his studies were made using simple experimental techniques. Werner was able to explain the nature of bonding in complexes and he concluded that in complexes, the metal shows two different sorts of valency: primary and secondary. Primary valences are normally ionisable whereas secondary valences are non-ionisable.
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