Problem 208
Using MO theory predict which of the following species has the shortest bond length? (a) \(\mathrm{O}_{2}^{+}\) (b) \(\mathrm{O}_{2}^{-}\) (c) \(\mathrm{O}_{2}^{2-}\) (d) \(\mathrm{O}_{2}^{2+}\)
Problem 209
Among the following the maximum covalent character is shown by the compound: (a) \(\mathrm{MgCl}_{2}\) (b) \(\mathrm{FeCl}_{2}\) (c) \(\mathrm{AlCl}_{3}\) (d) \(\mathrm{SnCl}_{2}\)
Problem 210
The hybridization of orbitals of \(\mathrm{N}\) atom in \(\mathrm{NO}_{3}^{-}, \mathrm{NO}_{2}^{+}\) and \(\mathrm{NH}_{4}^{+}\)are respectively: (a) \(s p^{2}, s p^{3}, s p\) (b) \(\mathrm{sp}, \mathrm{sp}^{2}, \mathrm{sp}^{3}\) (c) sp, sp \(^{3}, \mathrm{sp}^{2}\) (d) \(\mathrm{sp}^{2}, \mathrm{sp}, \mathrm{sp}^{3}\)
Problem 211
The struture of \(\mathrm{IF}_{7}\) is: (a) Octahedral (b) Trigonal bipyramid (c) Square pyramid (d) Pentagonal bipyramid
Problem 212
In which of the following pairs the two species are not isostructural? (a) \(\mathrm{PF}_{5}\) and \(\mathrm{BrF}_{5}\) (b) \(\mathrm{PCl}_{4}+\) and \(\mathrm{SiCl}_{4}\) (c) \(\mathrm{CO}_{3}^{2-}\) and \(\mathrm{NO}_{3}^{-}\) (d) \(\mathrm{AlF}_{6}^{3-}\) and \(\mathrm{SF}_{6}\)
Problem 214
In which of the following pairs of molecules/ions, both the species are not likely to exist? (a) \(\mathrm{H}_{2}^{2+}, \mathrm{He}_{2}\) (b) \(\mathrm{H}_{2}^{-}, \mathrm{H}_{2}^{2+}\) (c) \(\mathrm{H}_{2}^{+}, \mathrm{He}_{7}^{2-}\) (d) \(\mathrm{H}_{2}^{-}, \mathrm{He}_{2}^{2-}\)
Problem 215
When one of the following molecules is expected to exhibit diamagnetic behaviour? (a) \(\mathrm{O}_{2}\) (b) \(\mathrm{S}_{2}\) (c) \(\mathrm{C}_{2}\) (d) \(\mathrm{N}_{2}\)
Problem 216
The speces in which the atom is in a state of sphybridization is? (a) \(\mathrm{NO}_{2}^{-}\) (b) \(\mathrm{NO}_{3}^{-}\) (c) \(\mathrm{NO}_{2}^{2}\) (d) \(\mathrm{NO}_{2}^{+}\)
