CBSE 2024 · Region 5 · Set 3 · Q29 · 4 marks
The oxidation number of the central atom in a complex is defined as the charge it would carry if all the ligands are removed along with the electron pairs that are shared with the central atom. Similarly the charge on the complex is the sum of the charges of the constituent parts i.e. the sum of the charges on the central metal ion and its surrounding ligands. Based on this, the complex is called neutral if the sum of the charges of the constituents is equal to zero. However, for an anion or cationic complex, the sum of the charges of the constituents is equal to the charge on the coordination sphere. Based on the above information, answer the following questions :(a)What is the secondary valence of Co in $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+}$?(b)What type of isomerism is shown by the complex $\displaystyle \left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$ and $\displaystyle \left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2} \cdot \mathrm{H}_{2} \mathrm{O}$ ?Write the electronic configuration of $\displaystyle \mathrm{d}^{4}$ ion on the basis of crystal field theory when(i)$\displaystyle \Delta_{0}<\mathrm{P}$(ii)$\displaystyle \Delta_{0}>\mathrm{P}$Find the oxidation state and coordination number of the central metal ion in $\displaystyle \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}$
The oxidation number of the central atom in a complex is defined as the charge it would carry if all the ligands are removed along with the electron pairs that are shared with the central atom. Similarly the charge on the complex is the sum of the charges of the constituent parts i.e. the sum of the charges on the central metal ion and its surrounding ligands. Based on this, the complex is called neutral if the sum of the charges of the constituents is equal to zero. However, for an anion or cationic complex, the sum of the charges of the constituents is equal to the charge on the coordination sphere. Based on the above information, answer the following questions :
(a)
What is the secondary valence of Co in $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+}$?
(b)
What type of isomerism is shown by the complex $\displaystyle \left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$ and $\displaystyle \left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2} \cdot \mathrm{H}_{2} \mathrm{O}$ ?
Write the electronic configuration of $\displaystyle \mathrm{d}^{4}$ ion on the basis of crystal field theory when
(i)
$\displaystyle \Delta_{0}<\mathrm{P}$
(ii)
$\displaystyle \Delta_{0}>\mathrm{P}$
Find the oxidation state and coordination number of the central metal ion in $\displaystyle \left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}$
Marking-scheme solution
(a)
$\displaystyle 6$
b) solvate/hydrate isomerism
i) \(\displaystyle \mathrm{t}_{2 \mathrm{~g}}{ }^{3} \mathrm{e}_{\mathrm{g}}{ }^{1}\)
(ii)
\(\displaystyle \mathrm{t}_{2 \mathrm{~g}}{ }^{4} \mathrm{e}_{\mathrm{g}}{ }^{0}\)
Oxidation state= +$\displaystyle 3$
Coordination number \(\displaystyle =6\)
Coordination CompoundsDefinitions of Some Important Terms Pertaining to Coordination CompoundsApplycase_studymedium
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CBSE Class 12 Chemistry past-paper question from the 2024board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.