CBSE 2023 · Region 1 · Set 2 · Q31 · 4 marks
In coordination compounds, metals show two types of linkages, primary and secondary. Primary valencies are ionisable and are satisfied by negatively charged ions. Secondary valencies are non-ionisable and are satisfied by neutral or negative ions having lone pair of electrons. Primary valencies are non-directional while secondary valencies decide the shape of the complexes.(i)If $\displaystyle \mathrm{PtCl}_{2} \cdot 2 \mathrm{NH}_{3}$ does not react with $\displaystyle \mathrm{AgNO}_{3}$, what will be its formula?(ii)What is the secondary valency of $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$?(iii)Write the formula of Iron (III) hexacyanidoferrate (II) .(2)Write the IUPAC name of $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}$.Write the hybridization and magnetic behaviour of $\displaystyle \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$. [Atomic number: Ni=$\displaystyle 28$]
In coordination compounds, metals show two types of linkages, primary and secondary. Primary valencies are ionisable and are satisfied by negatively charged ions. Secondary valencies are non-ionisable and are satisfied by neutral or negative ions having lone pair of electrons. Primary valencies are non-directional while secondary valencies decide the shape of the complexes.
(i)
If $\displaystyle \mathrm{PtCl}_{2} \cdot 2 \mathrm{NH}_{3}$ does not react with $\displaystyle \mathrm{AgNO}_{3}$, what will be its formula?
(ii)
What is the secondary valency of $\displaystyle \left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$?
(iii)
Write the formula of Iron (III) hexacyanidoferrate (II) .
(2)
Write the IUPAC name of $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}$.
Write the hybridization and magnetic behaviour of $\displaystyle \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$. [Atomic number: Ni=$\displaystyle 28$]
Marking-scheme solution
(i) \(\displaystyle \left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]\)
(ii) $\displaystyle 6$
(iii) ($\displaystyle 1$) \(\displaystyle \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}\)
(2) Pentamminechloridocobalt(III) chloride. OR
(iii) \(\displaystyle \mathrm{dsp}^{2}\), diamagnetic
Coordination CompoundsWerner's Theory of Coordination CompoundsApplycase_studymedium
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CBSE Class 12 Chemistry past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.