Problem 1
Bond angle of \(109^{\circ} 28\) ' is found in: (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\stackrel{+}{\mathrm{CH}}_{3}\) (d) \({ }^{+} \mathrm{NH}_{4}\)
Problem 2
Hybridization of the underlined atom changes in which of the following transitions? (a) \(\mathrm{A} \mathrm{IH}_{3}\) changes to \(\mathrm{AlH}_{4}^{-}\) (b) \(\mathrm{H}_{2} \underline{\mathrm{O}}\) changes to \(\mathrm{H}_{3} \mathrm{O}^{+}\) (c) \(\underline{\mathrm{N}} \mathrm{H}_{3}\) changes to \(\mathrm{NH}_{4}^{+}\) (d) in all cases
Problem 3
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 4
A square planar complex is formed by hybridizationof the following atomic orbitals: (a) s, \(\mathrm{p}_{\mathrm{x}}, \mathrm{p}_{\mathrm{y}}, \mathrm{p}_{\mathrm{z}}\) (b) s, \(p_{x}, p_{y}, p_{z}, d\) (c) \(\mathrm{d}_{\mathrm{x}}^{2-2}{\mathrm{y}}^{2-\mathrm{s}}, \mathrm{p}_{\mathrm{x}}, \mathrm{p}_{\mathrm{y}}\) (d) s, p \(_{x}, p_{y}, p_{z}, d_{z}^{2}\)
Problem 5
Which of the following hydrogen bonds is the strongest? (a) \(\mathrm{F}-\mathrm{H} \ldots . . \mathrm{F}\) (b) \(\mathrm{O}-\mathrm{H} \ldots . \mathrm{O}\) (c) \(\mathrm{O}-\mathrm{H} \ldots \mathrm{F}\) (d) \(\mathrm{O}-\mathrm{H} \ldots \mathrm{N}\)
Problem 6
Which one of the following pairs of species have the same bond order? (a) \(\mathrm{CN}^{-}\) and \(\mathrm{NO}^{+}\) (b) \(\mathrm{CN}^{-}\) and \(\mathrm{CN}^{+}\) (c) \(\mathrm{O} 2^{-}\) and \(\mathrm{CN}^{-}\) (d) \(\mathrm{NO}^{+}\) and \(\mathrm{CN}^{+}\)
Problem 7
Which of the following species exhibits the diamagnetic behaviour? (a) \(\mathrm{O}_{2}^{+}\) (b) \(\mathrm{O}_{2}\) (c) NO (d) \(\mathrm{O}_{2}^{2-}\)
Problem 8
In which of the following compounds will the bond angle be maximum? (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{NH}_{4}^{+}\) (c) \(\mathrm{PCl}_{3}\) (d) \(\mathrm{SCl}_{2}\)
Problem 9
The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, \(\mathrm{K}^{+}, \mathrm{Ca}^{2+}\), \(\mathrm{Mg}^{2+}, \mathrm{Be}^{2+} ?\) (a) \(\mathrm{Be}^{2+}<\mathrm{K}^{+}<\mathrm{Ca}^{2}+<\mathrm{Mg}^{2+}\) (b) \(\mathrm{K}^{+}<\mathrm{Ca}^{2+}<\mathrm{Mg}^{2+}<\mathrm{Be}^{2+}\) (c) \(\mathrm{Ca}^{2+}<\mathrm{Mg}^{2+}<\mathrm{Be}^{2+}<\mathrm{K}^{+}\) (d) \(\mathrm{Mg}^{2+}<\mathrm{Be}^{2+}<\mathrm{K}^{+}<\mathrm{Ca}^{2+}\)
Problem 10
Which of the following is an electron deficient molecule? (a) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{PH}_{3}\) (c) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (d) \(\mathrm{SiH}_{4}\)
