Problem 11
In which of the following molecules/ions all the bonds are unequal? (a) \(\mathrm{SF}_{4}\) (b) \(\mathrm{SiF}_{4}\) (c) \(\mathrm{XeF}_{4}\) (d) \(\mathrm{BF}_{4}\)
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 which of the following ionization processes, the bond order has increased and the magnetic behaviour has changed? (a) \(\mathrm{NO} \rightarrow \mathrm{NO}^{+}\) (b) \(\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{+}\) (c) \(\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}^{+}\) (d) \(\mathrm{C}_{2} \rightarrow \mathrm{C}_{2}^{+}\)
Problem 14
Number of \(P-O\) bonds in \(\mathrm{P}_{4} \mathrm{O}_{10}\) is: (a) 17 (b) 16 (c) 15 (d) 6
Problem 15
Of the following sets which does not contain isoelectronic species? (a) \(\mathrm{SO}_{3}^{2-}, \mathrm{CO}_{3}^{2-}, \mathrm{NO}_{3}^{-}\) (b) \(\mathrm{CN}^{-}, \mathrm{N}_{2}, \mathrm{C}_{2}^{2-}\) (c) \(\mathrm{BO}_{3}{ }^{3}, \mathrm{CO}_{3}^{2}, \mathrm{NO}_{3}^{-}\) (d) \(\mathrm{PO}_{4}{ }^{3-}, \mathrm{SO}_{4}^{2-}, \mathrm{ClO}_{4}\)
Problem 16
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) \(\mathrm{BF}_{3}, \mathrm{PCl}_{3}\) (d) \(\mathrm{PF}_{5}, \mathrm{IF}_{5}\)
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 molecules/ions does not contain unpaired electrons? (a) \(\mathrm{O}_{2}^{2-}\) (b) \(\mathrm{B}_{2}\) (c) \(\mathrm{N}_{2}^{+}\) (d) \(\mathrm{O}_{2}\)
Problem 19
Which of the following is an electron deficient molecule? (a) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{BeCl}_{2}\) (d) \(\mathrm{SiCl}_{4}\)
Problem 20
The number and type of bonds between two carbon atoms in calcium carbide are: (a) One sigma, two pi (b) Two sigma, two pi (c) One sigma, one pi (d) Two sigma, one pi
