The difference between a weak field ligand and a strong field ligand is:
1. | Weak field ligands cause higher splitting in the d orbitals than strong field ligands. |
2. | Weak field ligands cause lower splitting in the d orbitals than strong field ligands. |
3. | Strong field ligands did not form a complex with metal ion. |
4. | None of the above. |
The crystal field splitting energy is:
1. | The heat of formation between the two levels (eg and t2g) |
2. | The combined pairing energy of the two levels (eg and t2g) |
3. | The combined energy of the three levels in octahedral |
4. | The combined energy of the two levels ( and ) |
[Cr(NH3)6]3+ is paramagnetic ,while is diamagnetic because:
1. | Electrons in the 3d orbitals remain unpaired in |
2. | Electrons in the 3d orbitals remain unpaired in [Cr(NH3)6]3+ |
3. | Electrons in the 3p orbitals remain unpaired in [Cr(NH3)6]3+ |
4. | Electrons in the 3p orbitals remain unpaired in |
A solution of [Ni(H2O)6]2+ is green, but a solution of [Ni(CN)4]2– is colorless because:
1. | There are paired electrons in [Ni(H2O)6]2+ while all electrons are unpaired in [Ni(CN)4]2– |
2. | There are unpaired electrons in [Ni(H2O)6]2+ while all electrons are paired in [Ni(CN)4]2– |
3. | There are unpaired electrons in [Ni(H2O)6]2+ and [Ni(CN)4]2– |
4. | None of the above. |
[Fe(CN)6]4– and [Fe(H2O)6]2+ are of different colors in dilute solutions because :
1. | Higher lattice energy value of [Fe(CN)6]4– as compared to [Fe(H2O)6]2+ |
2. | Higher CFSE value of [Fe(CN)6]4– as compared to [Fe(H2O)6]2+ |
3. | Lower CFSE value of [Fe(CN)6]4– as compared to [Fe(H2O)6]2+ |
4. | Lower lattice energy value of [Fe(CN)6]4– as compared to [Fe(H2O)6]2+ |
The nature of bonding in metal carbonyls is -
1. | The metal-carbon bonds in metal carbonyls have both σ and π characters. |
2. | The metal-carbon bonds in metal carbonyls have only σ character. |
3. | The metal-carbon bonds in metal carbonyls have only π character. |
4. | The metal-carbon bonds in metal carbonyls have only hydrogen bonding. |
The greater value of the stability constant of complex salt indicates -
1. The greater proportion of products.
2. The greater proportion of reactants
3. Lesser concentration of catalyst at equilibrium
4 . All of the above
The correct order for the wavelengths of absorption in the visible region for the following is:
\(\left[\mathrm{Ni}\left(\mathrm{NO}_2\right)_6\right]^{4-},\left[\mathrm{Ni}\left(\mathrm{NH}_3\right)_6\right]^{2+},\left[\mathrm{Ni}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{2+}\)
1. < <
2. > >
3.
4.
The number of unpaired electrons in the following complexes respectively are-
1. 1, 4, 5
2. 2, 4, 5
3. 0, 3, 4
4. 2, 3, 4
a. | Primary valencies are satisfied by negative ions while secondary valences are satisfied by negative ion only. |
b. | A metal ion has a definite number of secondary valences around the central atom. |
c. | Primary valences are usually ionizable, while secondary valences are non-ionizable |
The correct statements among the above are -
1. a, b
2. a, c
3. b, c
4. a, b, c