Chapter 13

The ratio of s-character in sp and sp \(^{3}\) hybridization is

Of the following, the number of species having unpaired electron are \(\mathrm{B}_{2}, \mathrm{KO}_{2}, \mathrm{BaO}_{2}, \mathrm{NO}_{2}, \mathrm{O}_{2}, \mathrm{NO}, \mathrm{ClO}_{2}, \mathrm{O}_{2}\left[\mathrm{AsF}_{6}\right]\)

Number of \(\mathrm{P}-\mathrm{O}\) bonds in \(\mathrm{P}_{4} \mathrm{O}_{10}\) is (a) 17 (b) 16 (c) 15 (d) 6

Bond angle of \(109^{\circ} 28\) ' is found in (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{CH}_{3}^{3}\) (d) \(\mathrm{NH}_{4}^{+}\)

Hybridization of the underlined atom changes in which of the following transitions? \(\quad\) [2002] (a) \(\mathrm{AIH}_{3}\) changes to \(\mathrm{AlH}_{4}^{-}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) changes to \(\mathrm{H}_{3} \mathrm{O}^{+}\) (c) \(\mathrm{NH}_{3}\) changes to \(\mathrm{NH}_{4}^{+}\) (d) in all cases

The number of lone pairs on \(\mathrm{Xe}\) in \(\mathrm{XeF}_{2}, \mathrm{XeF}_{4}\) and \(\mathrm{XeF}_{6}\) respectively are [2002] (a) \(3,2,1\) (b) \(2,4,6\) (c) \(1,2,3\) (d) \(6,4,2\)

A square planar complex is formed by hybridization of the following atomic orbitals [2002] (a) \(s, p_{x}, p_{y}, p_{z}\) (b) \(s, p_{x}, p_{y}, p_{z}, d\) (c) \(\mathrm{d}_{\mathrm{x}}^{2}-\mathrm{y}^{2}, \mathrm{~s}, \mathrm{p}_{\mathrm{x}}, \mathrm{p}_{y}\) (d) \(s, p_{x}, p_{y}, p_{z}, d_{z^{2}}\)

Select correct statement: [2002] (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 \(\mathrm{HBr}\)

Which one of the following compounds has the smallest bond angle in its molecule? \(\quad\) [2003] (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{H}_{2} \mathrm{~S}\) (d) \(\mathrm{NH}_{3}\)

Which one of the following pairs of molecules will have permanent dipole moments for both members? [2003] (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 \(\mathrm{CO}_{2}\)

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) \(\mathrm{PF}_{5}, \mathrm{IF}_{5}\)

The correct order of bond angles (smallest first) in \(\mathrm{H}_{2} \mathrm{~S}, \mathrm{NH}_{3}, \mathrm{BF}_{3}\) and \(\mathrm{SiH}_{4}\) is [2004] (a) \(\mathrm{H}_{2} \mathrm{~S}<\mathrm{SiH}_{4}<\mathrm{NH}_{3}<\mathrm{BF}_{3}\) (b) \(\mathrm{NH}_{3}<\mathrm{H}_{2} \mathrm{~S}<\mathrm{SiH}_{4}<\mathrm{BF}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{~S}<\mathrm{NH}_{3}<\mathrm{SiH}_{4}<\mathrm{BF}_{3}\) (d) \(\mathrm{H}_{2} \mathrm{~S}<\mathrm{NH}_{3}<\mathrm{BF}_{3}<\mathrm{SiH}_{4}\)

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? [2004] (a) bond length in \(\mathrm{NO}^{+}\)is greater than in 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

Which of the following has the regular tetrahedral structure? (a) \(\mathrm{BF}_{4}{\underline{\phantom{xx}}}^{-}\) (b) \(\mathrm{SF}_{4}\) (c) \(\left[\mathrm{Ni}(\mathrm{CN})_{a}\right]^{2-}\) (d) \(\mathrm{XeF}_{4}\)

The maximum number of \(90^{\circ}\) angles between bond pair-bond pair of electrons is observed in [2004] (a) \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) hybridization (b) \(\mathrm{sp}^{3} \mathrm{~d}\) hybridization (c) \(\mathrm{dsp}^{3}\) hybridization (d) \(\mathrm{dsp}^{2}\) hybridization

Which one of the following species is diamagnetic in nature? 2 (a) \(\mathrm{H}_{2}^{-}\) (b) \(\mathrm{H}_{2}\) (c) \(\mathrm{H}_{2}^{+}\) (d) \(\mathrm{He}_{2}^{+}\)

Lattice energy of an ionic compound depends upon [2005] (a) packing of ions only (b) size of the ion only (c) charge on the ion and size of the ion (d) charge on the ion only

The molecular shapes of \(\mathrm{SF}_{4}, \mathrm{CF}_{4}\) and \(\mathrm{XeF}_{4}\) are \([2005]\) (a) the same with 2,0 and 1 lone pairs of electrons on the central atom, respectively (b) the same with 1,1 and 1 lone pair of electrons on the central atom, respectively (c) different with 0,1 and 2 lone pairs of electrons on the central atom, respectively (d) different with 1,0 and 2 lone pairs of electrons on the central atom, respectively

The number and type of bonds between two carbon atoms in calcium carbide are \(\quad\) [2005] (a) one sigma, two pi (b) two sigma, two pi (c) one sigma, one pi (d) two sigma, one pi

Of the following sets which does not contain isoelectronic species? \([2005]\) (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) \(\mathrm{PO}_{4}^{3}, \mathrm{SO}_{4}^{2-}, \mathrm{ClO}_{4}^{-}\)

Which of the following is an electron deficient molecule? \(\quad\) [2005] (a) \(\mathrm{C}_{2} \mathrm{H}_{6}\) (b) \(\mathrm{PH}_{3}\) (c) \(\mathrm{B}_{2} \mathrm{H}_{6}\) (d) \(\mathrm{SiH}_{4}\)

In which of the following molecules/ions all the bonds are unequal? [2006] (a) \(\mathrm{SF}_{4}\) (b) \(\mathrm{SiF}_{4}\) (c) \(\mathrm{XeF}_{4}\) (d) \(\mathrm{BF}_{4}-\)

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) \(\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}{\underline{\phantom{xx}}}^{+}\) (d) \(\mathrm{C}_{2} \rightarrow \mathrm{C}_{2}^{+}\)

Which of the following hydrogen bonds is the strongest? (a) \(\mathrm{F}-\mathrm{H}_{\ldots} . . \mathrm{F}\) (b) \(\mathrm{O}-\mathrm{H}_{\ldots} \ldots \mathrm{O}\) (c) \(\mathrm{O}-\mathrm{H} \ldots . \mathrm{F}\) (d) \(\mathrm{O}-\mathrm{H} \ldots \mathrm{N}\)

Which of the following species exhibits the diamagnetic behaviour? (a) \(\mathrm{O}_{2}^{+}\) (b) \(\mathrm{O}_{2}\) (c) NO (d) \(\mathrm{O}_{2}^{2-}\)

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, \(\mathrm{K}^{+}, \mathrm{Ca}^{2+}, \mathrm{Mg}^{2+}, \mathrm{Be}^{2++}\) ? [2007] (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) \(\mathrm{Mg}^{2+}<\mathrm{Be}^{2+}<\mathrm{K}^{+}<\mathrm{Ca}^{2+}\)

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 \(\mathrm{CN}^{+}\)

Using MO theory predict which of the following species has the shortest bond length? [2009] (a) \(\mathrm{O}_{2}^{+}\) (b) \(\mathrm{O}_{2}^{-}\) (c) \(\mathrm{O}_{2}^{2}{\underline{\phantom{xx}}}^{2-}\) (d) \(\mathrm{O}_{2}^{2+}\)

Among the following the maximum covalent character is shown by the compound: [2011] (a) \(\mathrm{MgCl}_{2}\) (b) \(\mathrm{FeCl}_{2}\) (c) \(\mathrm{AlCl}_{3}\) (d) \(\mathrm{SnCl}_{2}\)

The hybridization of orbitals of \(\mathrm{N}\) atom in \(\mathrm{NO}_{3}^{-}, \mathrm{NO}_{2}^{+}\) and \(\mathrm{NH}_{4}{\underline{\phantom{xx}}}^{+}\)are respectively: \([2011]\) (a) \(s p^{2}, s p^{3}, s p\) (b) \(s p, s p^{2}, s p^{3}\) (c) \(s p, s p^{3}, s p^{2}\) (d) \(s p^{2}, s p, s p^{3}\)

The struture of \(\mathrm{IF}_{7}\) is: (a) Octahedral (b) Trigonal bipyramid (c) Square pyramid (d) Pentagonal bipyramid

In which of the following pairs the two species are not isostructural? (a) \(\mathrm{PF}_{5}\) and \(\mathrm{BrF}_{5}\) (b) \(\mathrm{PCl}_{4}+\) and \(\mathrm{SiCl}_{4}\) (c) \(\mathrm{CO}_{3}^{2-}\) and \(\mathrm{NO}_{3}^{-}\) (d) \(\mathrm{AlF}_{6}{\underline{\phantom{xx}}}^{3-}\) and \(\mathrm{SF}_{6}\)

In which of the following pairs of molecules/ions, both the species are not likely to exist? (a) \(\mathrm{H}_{2}^{2+}, \mathrm{He}_{2}\) (b) \(\mathrm{H}_{2}, \mathrm{H}_{2}^{2+}\) (c) \(\mathrm{H}_{2}^{+}, \mathrm{He}_{2}^{2-}\) (d) \(\mathrm{H}_{2}^{-}, \mathrm{He}_{2}^{2-}\)

The speces in which the atom is in a state of sphybridization is? (a) \(\mathrm{NO}_{2}^{-}\) (b) \(\mathrm{NO}_{3}^{-}\) (c) \(\mathrm{NO}_{2}\) (d) \(\mathrm{NO}_{2}^{+}\)