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Question : 5
Total: 12
(a) (i) Write the IUPAC name of the following complex:
K 2 [ PdCl 4 ]
(ii) Using crystal field theory, write the electronic configuration ofd 5 ∆ 0 > 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?
(ii) Using crystal field theory, write the electronic configuration of
(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?
Solution:
(a) (i) IUPAC name of K 2 [ PdCl 4 ]
(ii) If∆ 0 > P d 5 t 2 g 5 e g 0 e g
(iii) The complex compounds in which all the ligand which are connected with central atom are same or identical are called homoleptic complexes. For example:[ Ni ( CO ) 4 ] , [ Co ( NH 3 ) 6 ] + 3
OR
(b) (i) Chelate complexes are more stable than unidentate ligand because chelate ligand forms a ring with the central metal ion and are held by strong force of attraction and are less likely to dissociate. However, unidentate ligands are attached to central metal at one point which involves less force of attraction and are more likely to dissociate.
(ii) A series in which ligands are arranged in the order of increasing magnitude of crystal field splitting energy (CFSE), is called spectrochemical series.
The ligands present on the R.H.S of the series are strong field ligands while that on the L.H.S are weak field ligands.
I − < Br − < Cl − < SCN − < F − < OH − < C 2 O 4 2 −
< H 2 O < NCS − < EDTA 4 − < NH 3 < en <
CN − < CO
(ii) If
(iii) The complex compounds in which all the ligand which are connected with central atom are same or identical are called homoleptic complexes. For example:
OR
(b) (i) Chelate complexes are more stable than unidentate ligand because chelate ligand forms a ring with the central metal ion and are held by strong force of attraction and are less likely to dissociate. However, unidentate ligands are attached to central metal at one point which involves less force of attraction and are more likely to dissociate.
(ii) A series in which ligands are arranged in the order of increasing magnitude of crystal field splitting energy (CFSE), is called spectrochemical series.
The ligands present on the R.H.S of the series are strong field ligands while that on the L.H.S are weak field ligands.
| S.No. | ||
|---|---|---|
| 1. | These are the ligands used in octahedral complexes in which the crystal field stabilization energy | These are the ligands used in octahedral complexes in which the crystal field stabilization energy |
| 2. | Complexes formed by these ligands are also known as high spin complexes. | Complexes formed by these ligands are also known as low spin complexes |
| 3. | The complexes formed are generally paramagnetic in nature. | The complexes formed are mostly diamagnetic or comparatively less paramagnetic in nature. |
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