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In a complexometric titration of metal i...

In a complexometric titration of metal ion with ligand
`M("Metal ion") + L("Ligand")rarr C("Complex")` end point is estimated spectrophotometrically (through light absorption). If 'M' and 'C' do not absorb light and only 'L' absorbs, then the titration plot between absorbed light(A) versus volume of ligand 'L' (V) would look like :

A

B

C

D

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A
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Homoleptic octahedral complexes of a metal ion ' M^(3+) ' with three monodentate ligands L_(1),L_(2) and L_(3) absorb wavelengths in the region of green, blue and red respectively. The increasing order of the ligand strength is :

A. According to C.FT complex compound contain point charges R: The bonding between central metal ion and ligand is electrostatic

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Read the passage given below and answer the following questions : The crystal field theory (CFT) is an electrostatic model which considers the metal-ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand. Ligands are treated as point charges in case of anions or dipoles in case of neutral molecules. The five d orbitals in an isolated gaseous metal atom/ion have same energy, i.e., they are degenerate. This degeneracy is maintained if a spherically symmetrical field of negative charges surrounds the metal atom/ ion. However, when this negative field is due to ligands (either anions or the negative ends of dipolar molecules like NH_(3) and H_(2)O ) in a complex, it becomes asymmetrical and the degeneracy of the d orbitals is lifted. It results in splitting of the d orbitals. The CFSE for octahedral [CoCl_(6)]^(4-) is 18,000 cm^(-1) . The CFSE for tetrahedral [CoCl_(4)]^(2-) will be

Read the passage given below and answer the following questions : The crystal field theory (CFT) is an electrostatic model which considers the metal-ligand bond to be ionic arising purely from electrostatic interactions between the metal ion and the ligand. Ligands are treated as point charges in case of anions or dipoles in case of neutral molecules. The five d orbitals in an isolated gaseous metal atom/ion have same energy, i.e., they are degenerate. This degeneracy is maintained if a spherically symmetrical field of negative charges surrounds the metal atom/ ion. However, when this negative field is due to ligands (either anions or the negative ends of dipolar molecules like NH_(3) and H_(2)O ) in a complex, it becomes asymmetrical and the degeneracy of the d orbitals is lifted. It results in splitting of the d orbitals. An aqueous pink solution of cobalt(II) chloride changes to deep blue on addition of excess of HCl. This is because _________.

Valence bond theory for bonding in transition metal complexes was developed by Pauling. From the valence bond point of view, formation of a complex involves reaction between Lewis bases (ligands) and a Lewis acid (metal atom or metal ion) with the formation of coordination covalent (or dative) bonds between them. The model utilizes hybridization of metal s, p and d valence orbitals to account for the observed structures and magnetic properies of complexes. Valence bond theory is able to deal satisfactorily with many stereo chemical and magnetic properies but is has nothing to say about electronic spectra or the reason for the kinetic inertness of chromium (III) and low spin cobalt (III) octahedral complexes. To understand this and more other features of transition metal we must turn to other theories like crystal field theory etc. Pure crystal field theory assumes that the only interaction between the metal ion and the ligands is an electrostatic or ionic one with the ligands being regarded as negative point charges. This theory is quite successful in interpreting many important properties of complexes. The hybridization of [NiCl_(2)(PPh_(3))_(2)]" and "[NiCl_(2).(Pme_(3))_(2)] are respectively (consider PPh_(3) a bulkier ligand than Pme_(3) ) :

RESONANCE-COORDINATION COMPOUNDS-Exercise-3 Online Exam
  1. Which of the following name formula combinations is not correct ?

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  2. Consider the coordination compound , [Co(NH(3))(6)]Cl(3). In the forma...

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  3. Among the following species the one which causes the highest CFSE, De...

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  4. Which of the following complexes will mostly likely abosorb visible li...

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  5. An octahedral complex with molecular composition M.5NH(3).Cl.SO(4) has...

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  6. Nickel (Z=28) combines with a uninegative monodenatate ligands to for...

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  7. The correct statement on the isomerism associated with the following c...

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  8. Which molecule/ion among the following cannot act as a ligand in compl...

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  9. Which of the following complex ions has electrons that are symmetrical...

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  10. Identify the correct trend given below : ( Atomic no : Ti=22, Cr=24 an...

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  11. Which one of the following complexes will consume more equivalent of a...

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  12. Which of the following is an example of homoleptic complex ?

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  13. sp^(3)d^(2) hybridization is not displayed by :

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  14. [Co(2)(CO)(8)] displays :

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  15. The correct combination is :

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  16. The correct order of spin-only magnetic moments among the following is...

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  17. The total number of possible isomers of sqaure-planar [Pt(Cl)(NO(2))(N...

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  18. In a complexometric titration of metal ion with ligand M("Metal ion"...

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  19. In Wilkinson's catalyst, the hybridization of central metal ion and it...

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  20. Which of the following complexes will show geometrical isomerism ?

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