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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 5 · Set 2 · Q5
(a) (i) Write the IUPAC name of the following complex: [ Pt ( NH_3)_6] Cl_4 (ii) On the basis of crystal field theory, write the electronic…
(a)(i)
Write the IUPAC name of the following complex : $\displaystyle \left[\operatorname{Pt}\left(\mathrm{NH}_{3}\right)_{6}\right] \mathrm{Cl}_{4}$
(ii)
On the basis of crystal field theory, write the electronic configuration of $\displaystyle \mathrm{d}^{4}$ ion, if $\displaystyle \Delta_{0}<\mathrm{P}$.
(iii)
What are Heteroleptic complexes?
OR
(b)(i)
Using IUPAC norms write the formulas for the following :
(i.i) Pentaamminenitrito-N-Cobalt (III)
(i.ii) Tetrahydroxidozincate (II)
(ii)
What is crystal field splitting energy ?
Marking-scheme solution
(a) (i) Hexaammineplatinum (IV) chloride
(ii) \(\displaystyle \mathrm{t}_{2 \mathrm{~g}}{ }^{3} \mathrm{e}_{\mathrm{g}}{ }^{1}\)
(iii) Complexes in which a metal atom / ion is bound to more than one kind of donor groups / ligands.
(b)
(i.i) \(\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{NO}_{2}\right]^{2+}\)
(i.ii) \(\displaystyle \left[\mathrm{Zn}(\mathrm{OH})_{4}\right]^{2-}\)
(ii)
The energy separation between \(\displaystyle \mathrm{t}_{2 \mathrm{~g}}\) and \(\displaystyle \mathrm{e}_{\mathrm{g}}\) levels (splitting of d orbitals) due to the presence of ligands.
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CBSE Class 12 Chemistry past-paper question from the 2022 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.