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Chemistry · 2022 · 3 marks
CBSE 2022 · Region 5 · Set 1 · Q5
(a) (i) Write the IUPAC name of the following complex: K_2[ PdCl_4] (ii) Using crystal field theory, write the electronic configuration of d^5 ion,…
(a)(i)
Write the IUPAC name of the following complex :$\displaystyle \mathrm{K}_{2}\left[\mathrm{PdCl}_{4}\right]$
(ii)
Using crystal field theory, write the electronic configuration of $\displaystyle \mathrm{d}^{5}$ ion, if $\displaystyle \Delta_{0}>\mathrm{P}$.
(iii)
What are Homoleptic complexes?
OR
(b)(i)
Why chelate complexes are more stable than complexes with unidentate ligands ?
(ii)
What is "spectrochemical series" ? What is the difference between a weak field ligand and a strong field ligand ?
Marking-scheme solution
(a) (i) Potassium tetrachloridopalladate (II)/ Potassium tetrachloropalladate (II)
(ii) \(\displaystyle \mathrm{t}_{2 \mathrm{~g}}{ }^{5} \mathrm{e}_{\mathrm{g}}{ }^{0}\)
(iii) Homoleptic complex: The complex in which metal atom / ion is bound to only one kind of donor groups or same kind of ligands.
(b) (i) two or more donor atoms simultaneously bind to a single metal ion / cyclic structure / stronger bond between metal and ligand / Gibbs energy in chelates is lower than unidentate ligand complexes.
(ii) ligands can be arranged in a series in the order of increasing field strength / Series based on the absorption of light by complexes with different ligands.
| Weak field ligand | Strong field ligand |
| \(\displaystyle \Delta_{\mathrm{o}}<\mathrm{P}\) | \(\displaystyle \Delta_{\mathrm{o}}>\mathrm{P}\) |
| lower d-d orbitals splitting energy does not favour pairing of electrons. | higher d-d orbitals splitting energy does not favour pairing of electrons. |
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