Problem 75
The shape of \(\mathrm{NO}_{3}^{-}\) is planar. It is formed by the overlapping of oxygen orbitals with which orbitals of nitrogen are (1) sp \(^{3}\) hybridised (2) sp \(^{2}\) hybridised (3) sp hybridiscd (4) 3 purc p-orbitals
Problem 76
Which hybridisation results in non-planar orbitals? (1) sp (2) \(\mathrm{sp}^{2}\) (3) \(\mathrm{sp}^{3}\) (4) \(\mathrm{dsp}^{2}\)
Problem 77
The hybridisation of carbon in diamond, graphitc and acctylene is (1) \(\mathrm{sp}^{3}, \mathrm{sp}^{2}\), sp (2) \(\mathrm{sp}^{3}, \mathrm{sp}, \mathrm{sp}^{2}\) (3) \(\mathrm{sp}^{2}, \mathrm{sp}^{3}, \mathrm{sp}\) (4) \(\mathrm{sp}, \mathrm{sp}^{2}, \mathrm{sp}^{3}\)
Problem 81
Which has triangular planar shape? (1) \(\mathrm{CH}_{3}^{-}\) (2) \(\mathrm{ClO}_{2}^{-}\) (3) \(\mathrm{H}_{3} \mathrm{O}^{+}\) (4) \(\mathrm{ClO}_{3}^{-}\)
Problem 82
Which of the following pairs arc nonlincar? (1) \(\mathrm{NH}_{3}, \mathrm{CO}_{2}\) (2) \(\mathrm{NH}_{3}, \mathrm{H}_{2} \mathrm{O}\) (3) \(\mathrm{CO}_{2}, \mathrm{BeCl}_{2}\) (4) \(\mathrm{BeCl}_{2}, \mathrm{NH}_{3}\)
Problem 83
Which of the following statement is false? (1) Octahedral molccular shape exists in sp \(^{3} \mathrm{~d}^{2}\) hybridisation. (2) \(\mathrm{XcF}_{2}\) involves \(\$ \mathrm{p}^{3} \mathrm{~d}\) hybridisation. (3) The repulsion among four hybrid orbitals is smallest if they point to the corners of a square. (4) IIybridisation can take place only between orbitals of roughly the same energy.
Problem 84
A triatomic molecule must be either linear with a bond angle of \(180^{\circ}\) or else (1) Pyramidal (2) Tetrahedral (3) Bent (4) L-shaped
Problem 87
Which one of the following is not a consequence of hybridisation? (1) effective overlapping of orbitals (2) minimised repulsion between orbital electrons (3) stronger bonds (4) enhanced reactivity of the molecule
Problem 88
\(\mathrm{PCl}_{5}\) in the solid state cxists as \(\mathrm{PCl}_{4}^{+}\) and \(\mathrm{PCl}_{6}^{-}\) because (1) Solid \(\mathrm{PCl}_{5}\) is a conduetor. (2) \(\mathrm{PCl}_{4}\) and \(\mathrm{PCl}_{6}\) have stable symmetrical structures unlike \(\mathrm{PCl}_{5}\) that has asymmetrical strueture. (3) lon pairs are more stable than neutral molecules. (4) Phosphorous belongs to \(\mathrm{V}\) group in the periodic table.
Problem 89
Regarding hybridisation which is incorrect? (1) \(\mathrm{BF}_{3}, \mathrm{C}_{2} \mathrm{H}_{4}, \mathrm{C}_{6} \mathrm{H}_{6}\) involves sp \(^{2}\) hybridisation. (2) \(\mathrm{BeF}_{2}, \mathrm{C}_{2} \mathrm{H}_{2}, \mathrm{CO}_{2}\) involves sp hybridisation. (3) \(\mathrm{NH}_{3}, \mathrm{H}_{2} \mathrm{O}, \mathrm{CCl}_{4}\) involves sp \(^{3}\) hybridisation. (4) \(\mathrm{CH}_{4}, \mathrm{C}_{2} \mathrm{H}_{4}, \mathrm{C}_{2} \mathrm{H}_{2}\) involves \(\mathrm{sp}^{2}\) hyoridisation.
