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Chemistry · 2023 · 4 marks
CBSE 2023 · Region 1 · Set 2 · Q31
In coordination compounds, metals show two types of linkages, primary and secondary. Primary valencies are ionisable and are satisfied by negatively…
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)(1)
Write the formula of Iron (III) hexacyanidoferrate (II) .
(2)
Write the IUPAC name of $\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2}$.
OR
(iii)
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
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CBSE Class 12 Chemistry past-paper question from the 2023 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.