Problem 184
The number of lone pairs on \(\mathrm{Xe}\) in \(\mathrm{XeF}_{2}, \mathrm{XeF}_{4}\) and \(\mathrm{XeF}_{6}\) respectively are (a) \(3,2,1\) (b) \(2,4,6\) (c) \(1,2,3\) (d) \(6,4,2\)
Problem 185
A square planar complex is formed by hybridization of the following atomic orbitals (a) s, \(\mathrm{p}_{\mathrm{x}}, \mathrm{p}_{y}, \mathrm{p}_{z}\) (b) \(s, p_{x}, p_{y}, p_{z}, d\) (c) \(\mathrm{d}_{x^{2}-y^{2}}, \mathrm{~s}, \mathrm{p}_{x}, \mathrm{p}_{\mathrm{y}}\) (d) \(\mathrm{s}, \mathrm{p}_{\mathrm{x}}, \mathrm{p}_{y}, \mathrm{p}_{2}, \mathrm{~d}_{z^{2}}\)
Problem 187
Select correct statement: (a) when a covalent bond is formed, transfer of electrons takes place (b) pure \(\mathrm{H}_{2} \mathrm{O}\) does not contain any ion (c) a bond is formed when attractive forces overcome repulsive forces (d) HF is less polar than \(\mathrm{HBr}\)
Problem 188
Which one of the following compounds has the smallest bond angle in its molecule? (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{H}_{2} \mathrm{~S}\) (d) \(\mathrm{NH}_{3}\)
Problem 189
Which one of the following pairs of molecules will have permanent dipole moments for both members? (a) \(\mathrm{SiF}_{4}\) and \(\mathrm{NO}_{2}\) (b) \(\mathrm{NO}_{2}\) and \(\mathrm{CO}_{2}\) (c) \(\mathrm{NO}_{2}\) and \(\mathrm{O}_{3}\) (d) \(\mathrm{SiF}_{4}\) and \(\mathrm{CO}_{2}\)
Problem 190
The pair of species having identical shapes for molecules of both species is (a) \(\mathrm{CF}_{4}, \mathrm{SF}_{4}\) (b) \(\mathrm{XeF}_{2}, \mathrm{CO}_{2}\) (c) \(\mathrm{BF}_{3}^{4}, \mathrm{PCl}_{3}\) (d) \(\mathrm{PF}_{5}, \mathrm{IF}_{5}\)
Problem 192
The bond order in \(\mathrm{NO}\) is \(2.5\) while that in \(\mathrm{NO}^{+}\)is 3 . Which of the following statements is true for these two species? (a) bond length in \(\mathrm{NO}^{+}\)is greater than in \(\mathrm{NO}\) (b) bond length in \(\mathrm{NO}\) is greater than in \(\mathrm{NO}^{+}\) (c) bond length in \(\mathrm{NO}^{+}\)is equal than in NO (d) bond length is unpredictable
Problem 194
The maximum number of \(90^{\circ}\) angles between bond pair-bond pair of electrons is observed in (a) sp \(^{3} \mathrm{~d}^{2}\) hybridization (b) \(\mathrm{sp}^{3} \mathrm{~d}\) hybridization (c) \(\mathrm{dsp}^{3}\) hybridization (d) \(\mathrm{dsp}^{2}\) hybridization
Problem 195
Which one of the following species is diamagnetic in nature? (a) \(\mathrm{H}_{2}^{-}\) (b) \(\mathrm{H}_{2}\) (c) \(\mathrm{H}_{2}^{+}\) (d) \(\mathrm{He}_{2}^{+}\)
Problem 196
Which one of the following species is diamagnetic in nature? (a) \(\mathrm{H}_{2}^{-}\) (b) \(\mathrm{H}_{2}\) (c) \(\mathrm{H}_{2}^{+}\) (d) \(\mathrm{He}_{2}^{+}\)
