Problem 11
In a regular octahedral molecule, \(\mathrm{MX}_{6}\) the number of X-M-X bonds at an angle of \(180^{\circ}\) is (a) three (b) two (c) \(\operatorname{six}\) (d) four
Problem 12
Among the following pairs, the one in which the two species are not isostructural is (a) \(\mathrm{SiF}_{4}\) and \(\mathrm{SF}_{4}\) (b) \(\mathrm{IO}_{3}^{-}\)and \(\mathrm{XeO}_{3}\) (c) \(\mathrm{BH}_{4}^{-}\)and \(\mathrm{NH}_{4}^{+}\) (d) \(\mathrm{PF}_{6}^{-}\)and \(\mathrm{SF}_{6}\)
Problem 13
In an octahedral structure, the pair of \(\mathrm{d}\) orbitals involved in \(\mathrm{d}^{2} \mathrm{sp}^{3}\) hybridization is (a) \(\mathrm{d}_{x^{2}-y^{2}}, \mathrm{~d}_{z^{2}}\) (b) \(\mathrm{d}_{x x}, \mathrm{~d}_{x^{2}-y^{2}}\) (c) \(\mathrm{d}_{z}=\mathrm{d}_{x z}\) (d) \(\mathrm{d}_{\mathrm{xy}}, \mathrm{d}_{y z}\)
Problem 14
Which of the following is the electron deficient molecule? (a) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (c) \(\mathrm{SiH}_{4}\) (d) \(\mathrm{PH}_{3}\)
Problem 15
Which of the following molecules has trigonal planar geometry? (a) \(\mathrm{BF}_{3}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{PCl}_{3}\) (d) \(\mathrm{IF}_{3}\)
Problem 16
Which of the following would have a permanent dipole moment? (a) \(\mathrm{SiF}_{4}\) (b) \(\mathrm{SF}_{4}\) (c) \(\mathrm{XeF}_{4}\) (d) \(\mathrm{BF}_{3}\)
Problem 17
In which of the following molecules all the bonds are not equal? (a) \(\mathrm{AlF}_{3}\) (b) \(\mathrm{NF}_{3}\) (c) \(\mathrm{ClF}_{3}\) (d) \(\mathrm{BF}_{3}\)
Problem 18
Which of the following species has a linear shape? (a) \(\mathrm{NO}_{2}^{+}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{NO}_{2}^{-}\) (d) \(\mathrm{SO}_{2}\)
Problem 19
Which of the following is not isostructural with \(\mathrm{SiCl}_{4} ?\) (a) \(\mathrm{PO}_{4}^{3-}\) (b) \(\mathrm{NH}_{4}^{+}\) (c) \(\mathrm{SCl}_{4}\) (d) \(\mathrm{SO}_{4}^{2-}\)
Problem 21
The ratio of \(\pi\) and \(\sigma\) bonds in benzene is (a) \(1: 2\) (b) \(1: 4\) (c) \(1: 6\) (d) \(1: 6\)
