91Ó°ÊÓ

Among which of the following pairs of ions, the lower oxidation state in aqueous solution is more stable than the other? (a) \(\mathrm{Ti}^{+}, \mathrm{Ti}^{3+}\) (b) \(\mathrm{V}^{2+}, \mathrm{VO}^{2+}\) (c) \(\mathrm{Cr}^{2+}, \mathrm{Cr}^{3+}\) (d) \(\mathrm{Cu}^{+}, \mathrm{Cu}^{2+}\)

The number of incomplete orbitals in inner transitior elements is? (a) 1 (b) 4 (c) 2 (d) 3

A complex compound of \(\mathrm{Co}^{3+}\) with molecular formula CoCl \(_{x} \cdot y \mathrm{NH}_{3}\) gives a total of 3 ions when dissolved in water. How many \(\mathrm{Cl}-\) ions satisfy both primary as well as the secondary valencies in this complex? (a) 3 (b) 1 (c) 4 (d) zero

Hardness of Transition elements is due to: (a) Large atomic size (b) Metallic bonding (c) Covalent bonding (d) High Ionisaton energy

Lanthanides and actinides resemble each other in: (a) Oxidation state (b) Ionization energy (c) Formation of complexes (d) Electron configuration

For which lanthanide are \(+2\) and \(+3\) oxidation states are common? (a) Eu (b) \(\mathrm{Na}\) (c) \(\mathrm{Ce}\) (d) La

Lanthanoid contraction is caused due to: (a) The appreciable shielding of outer electrons by 4felectrons from the nuclear charge (b) The appreciable shielding on outer electrons by 5 delectrons from the nuclear charge (c) The same effective nuclear charge from \(\mathrm{Ce}\) to \(\mathrm{Lu}\) (d) The imperfect shielding of outer electrons by \(4 \mathrm{f}\) electrons from the nuclear charge

Which one of the following ions is colourless in its aqueous solution? (a) \(\mathrm{T}_{1}^{3+}\) (b) \(\mathrm{Cu}^{2+}\) (c) \(\mathrm{Ni}^{2+}\) (d) \(\mathrm{Zn}^{2+}\)

Which one of the following ions exhibit highest magnetic moment? (a) \(\mathrm{Cu}^{2+}\) (b) \(\mathrm{Ti}^{3+}\) (c) \(\mathrm{Ni}^{2+}\) (d) \(\mathrm{Mn}^{2+}\)

Which one of the following is a diamagnetic ion? (a) \(\mathrm{Cu}^{2+}\) (b) \(\mathrm{Mn}^{2+}\) (c) \(\mathrm{Sc}^{3+}\) (d) \(\mathrm{Co}^{2+}\)