Chapter 13

Which one of the following is a planar molecule? (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{H}_{3} \mathrm{O}^{+}\) (c) \(\mathrm{BCl}_{3}\) (d) \(\mathrm{PCl}_{3}\)

The molecule having largest dipole moment among the following is (a) \(\mathrm{CHI}_{3}\) (b) \(\mathrm{CH}_{4}\) (c) \(\mathrm{CHCl}_{3}\) (d) \(\mathrm{CCl}_{4}\)

Compound \(\mathrm{X}\) is an anhydride of sulphuric acid. The number of sigma bonds and the number of pi bonds present in \(\mathrm{X}\) are respectively (a) 3,3 (b) 4,2 (c) 2,4 (d) 4,3

Which one of the following is a correct set? (a) \(\mathrm{H}_{2} \mathrm{O}, \mathrm{sp}^{3}\), angular (b) \(\mathrm{H}_{2} \mathrm{O}, \mathrm{sp}^{2}\), linear (c) \(\mathrm{NH}_{4}^{+}, \mathrm{dsp}^{2}\), square planar (d) \(\mathrm{CH}_{4}\), \(\mathrm{dsp}^{2}\), tetrahedral

How many sigma and pi bonds are present in toluene? (a) \(3 \pi+15 \sigma\) (b) \(6 \pi+6 \sigma\) (c) \(3 \pi+6 \sigma\) (d) \(3 \pi+8 \sigma\)

Which of the following molecules has a zero dipole moment? (a) \(\mathrm{BeCl}_{2}\) (b) \(\mathrm{HCl}\) (c) \(\mathrm{NH}_{3}\) (d) \(\mathrm{H}_{2} \mathrm{O}\)

Which one of the following molecules has the smallest bond angle? (a) \(\mathrm{H}_{2} \mathrm{O}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{H}_{2} \mathrm{Se}\) (d) \(\mathrm{H}_{2} \mathrm{~S}\)

In which of the following molecules the central atom does not follow the octet rule? (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{H}_{2} \mathrm{~S}\) (c) \(\mathrm{BF}_{3}\) (d) \(\mathrm{PCl}_{3}\)

Which one of the following statements is true? (a) The dipole moment of \(\mathrm{NF}_{3}\) is more than \(\mathrm{NH}_{3}\) (b) The dipole moment of \(\mathrm{NF}_{3}\) is less than \(\mathrm{NH}_{3}\) (c) The dipole moment of \(\mathrm{NH}_{3}\) is zero (d) The dipole moment of \(\mathrm{NF}_{3}\) is equal to \(\mathrm{NH}_{3}\)

Bond angle in water is (a) \(90^{\circ}\) (b) \(104.5^{\circ}\) (c) \(109.5^{\circ}\) (d) \(120^{\circ}\)

Which of the following is a linear molecule? (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{CH}_{4}\) (c) \(\mathrm{H}_{2} \mathrm{O}\) (d) \(\mathrm{BeCl}_{2}\)

Hydrogen bond is strongest in (a) \(\mathrm{S}-\mathrm{H}-\mathrm{O}\) (b) \(\mathrm{O}-\mathrm{H}-\mathrm{S}\) (c) \(\mathrm{F}-\mathrm{H}-\mathrm{F}\) (d) \(\mathrm{O}-\mathrm{H}-\mathrm{N}\)

Which of the following has the highest bond order? (a) \(\mathrm{N}_{2}\) (b) \(\mathrm{O}_{2}\) (c) \(\mathrm{He}_{2}\) (d) \(\mathrm{H}_{2}\)

Which of the following is diamagnetic? (a) \(\mathrm{H}_{2}^{+}\) (b) \(\mathrm{O}_{2}\) (c) \(\mathrm{Li}_{2}\) (d) \(\mathrm{He}_{2}^{+}\)

Iodine pentafluoride has which of the following hybridization? (a) \(\mathrm{d}^{2} \mathrm{sp}^{3}\) (b) \(\mathrm{dsp}^{3}\) (c) \(\mathrm{sp}^{3} \mathrm{~d}\) (d) \(\mathrm{sp}^{3} \mathrm{~d}^{2}\)

The number of lone pairs of electrons present in central atom of \(\mathrm{ClF}_{3}\) is (a) 0 (b) 1 (c) 2 (d) 3

Bond angle in \(\mathrm{XeO}_{3}\) is (a) \(107^{\circ}\) (b) \(119^{\circ}\) (c) \(92^{\circ}\) (d) \(103^{\circ}\)

Which of the following molecule is planar? (a) \(\mathrm{CH}_{4}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{C}_{2} \mathrm{H}_{4}\) (d) \(\mathrm{SiCl}_{4}\)

The paramagnetism of \(\mathrm{O}_{2}{\underline{\phantom{xx}}}^{+}\)is due to the presence of an odd electron in the MO (a) \(\sigma^{*} 2 \mathrm{~s}\) (b) \(\pi 2 p y\) (c) \(\sigma^{*} 2 p x\) (d) \(\pi^{*} 2 \mathrm{py}\)

Among the following compound which one has maximum number of lone pairs of electrons on central atom (a) \(\left[\mathrm{ClO}_{3}\right]\) (b) \(\mathrm{XeF}_{4}\) (c) \(\mathrm{SF}_{4}\) (d) \(\left[\mathrm{I}_{3}\right]\)

The acid having \(\mathrm{O}-\mathrm{O}\) bond is (a) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{3}\) (b) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}\) (c) \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{8}\) (d) \(\mathrm{H}_{2} \mathrm{~S}_{4} \mathrm{O}_{6}\)

The species having tetrahedral shape is (a) \(\left[\mathrm{PdCl}_{4}\right]^{2}\) (b) \(\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2}\) (c) \(\left[\mathrm{Pd}(\mathrm{CN})_{4}\right]^{2}\) (d) \(\left[\mathrm{NiCl}_{4}\right]^{2}\)

Total number of lone pair of electrons in \(\mathrm{XeOF}_{4}\) is (a) 0 (b) 1 (c) 2 (d) 3

The correct order of hybridization of the central atom in the following species \(\mathrm{NH}_{3}, \mathrm{PtCl}_{4}^{-2}, \mathrm{PCl}_{5}\) and \(\mathrm{BCl}_{3}\) is (a) \(\mathrm{dsp}^{2}, \mathrm{sp}^{3} \mathrm{~d}, \mathrm{sp}^{2}\) and \(\mathrm{sp}^{3}\) (b) \(\mathrm{sp}^{3}, \mathrm{dsp}^{2}, \mathrm{sp}^{3} \mathrm{~d}, \mathrm{sp}^{2}\) (c) \(\mathrm{dsp}^{2}, \mathrm{sp}^{2}, \mathrm{sp}^{3}, \mathrm{sp}^{3} \mathrm{~d}\) (d) \(\mathrm{dsp}^{2}, \mathrm{sp}^{3}, \mathrm{sp}^{2}, \mathrm{sp}^{3} \mathrm{~d}\)

Amongst \(\mathrm{H}_{2} \mathrm{O}, \mathrm{H}_{2} \mathrm{~S}, \mathrm{H}_{2} \mathrm{Se}\) and \(\mathrm{H}_{2}\) Te the one with the highest boiling point is (a) \(\mathrm{H}_{2} \mathrm{O}\) because of hydrogen bonding (b) \(\mathrm{H}_{2}\) Te because of higher molecular weight (c) \(\mathrm{H}_{2}^{\circ} \mathrm{S}\) because of hydrogen bonding (d) \(\mathrm{H}_{2} \mathrm{Se}\) because of lower molecular weight.

Which one of the following compounds has sp \(^{2}\) hybridization? (a) \(\mathrm{CO}_{2}\) (b) \(\mathrm{SO}_{2}\) (c) \(\mathrm{N}_{2} \mathrm{O}\) (d) \(\mathrm{CO}\)

Which contains both polar and non-polar bonds? (a) \(\mathrm{NH}_{4} \mathrm{Cl}\) (b) \(\mathrm{HCN}\) (c) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (d) \(\mathrm{CH}_{4}\)

Among the following compounds the one that is polar and has the central atom with sp² hybridization is (a) \(\mathrm{H}_{2} \mathrm{CO}_{3}\) (b) \(\mathrm{SiF}_{4}\) (c) \(\mathrm{BF}_{3}\) (d) \(\mathrm{HClO}_{2}\)

Which one of the following has zero dipole moment? (a) \(\mathrm{ClF}\) (b) \(\mathrm{PCl}_{3}\) (c) \(\mathrm{SiF}_{4}\) (d) \(\mathrm{CFCl}_{3}\)

Among the following compounds which contain all 3 type of bonds (i) \(\mathrm{NH}_{4} \mathrm{Cl}\) (ii) \(\mathrm{K}_{3} \mathrm{Fe}(\mathrm{CN})_{6}\) (iii) \(\mathrm{H}_{2} \mathrm{O}_{2}\) (iv) \(\mathrm{H}_{2} \mathrm{SO}_{4}\) (v) \(\mathrm{CaCO}_{3}\) (a) I, II (b) I, II, V (c) I, II, IV (d) I, II, III

In which of the following species, intramolecular H-bonding occurs? 1\. acetate ion 2\. salicylate ion 3\. propanoic acid 4\. o-nitrophenol (a) \(1,3,4\) (b) \(1,2,4\) (c) 2,4 (d) 4 only

The relationship between the dissociation energy of \(\mathrm{N}_{2}\) and \(\mathrm{N}_{2}{\underline{\phantom{xx}}}^{+}\)is (a) dissociation energy of \(\mathrm{N}_{2}^{+}>\)dissociation energy of \(\mathrm{N}_{2}\) (b) dissociation energy of \(\mathrm{N}_{2}=\) dissociation energy of \(\mathrm{N}_{2}^{+}\) (c) dissociation energy of \(\mathrm{N}_{2}>\) dissociation energy of \(\mathrm{N}_{2}^{+}\) (d) dissociation energy of \(\mathrm{N}_{2}\) can either be lower or higher than the dissociation energy of \(\mathrm{N}_{2}\)

In \(\mathrm{X}-\mathrm{H}-\mathrm{Y}\), where both \(\mathrm{X}\) and \(\mathrm{Y}\) are electronegative elements (a) electron density of \(\mathrm{X}\) will increase and the electron density on \(\mathrm{H}\) will decrease (b) on both species electron density will increase (c) on both species electron density will decrease (d) on \(\mathrm{X}\) the electron density will decrease and on \(\mathrm{H}\) it will increases

Nitrogen forms \(\mathrm{N}_{2}\), but phosphorous is converted into \(\mathrm{P}_{4}\) from \(\mathrm{P}\), the reason is (a) triple bond is present between phosphorous atom (b) \(\mathrm{p} \pi-\mathrm{p} \pi\) bonding is strong (c) p \(\pi-\mathrm{p} \pi\) bonding is weak (d) multiple bond is formed easily

In \(\mathrm{BrF}_{3}\) molecule, the lone pairs occupy equatorial position to minimize (a) lone pair- bond pair repulsion only (b) bond pair-bond pair repulsion only (c) lone pair-lone pair repulsion and lone pair bond pair repulsion (d) lone pair-lone pair repulsion only

\(\mathrm{H}_{2} \mathrm{O}\) is dipolar, whereas \(\mathrm{BeF}_{2}\) is not. It is because (a) the electronegativity of \(\mathrm{F}\) is greater than that of \(\mathrm{O}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) involves hydrogen bonding where as \(\mathrm{BeF}_{2}\) is a discrete molecule (c) \(\mathrm{H}_{2} \mathrm{O}\) is linear and \(\mathrm{BeF}_{2}\) is angular (d) \(\mathrm{H}_{2} \mathrm{O}\) is angular and \(\mathrm{BeF}_{2}\) is linear

The correct sequence of increasing covalent character is represented by (a) \(\mathrm{LiCl}<\mathrm{NaCl}<\mathrm{BeCl}_{2}\) (b) \(\mathrm{BeCl}_{2}<\mathrm{LiCl}<\mathrm{NaCl}\) (c) \(\mathrm{NaCl}<\mathrm{LiCl}<\mathrm{BeCl}_{2}\) (d) \(\mathrm{BeCl}_{2}<\mathrm{NaCl}<\mathrm{LiCl}\)

Among the following species the ones having square planar geometry for central atom are 1\. \(\mathrm{XeF}_{4}\) 2\. \(\mathrm{SF}_{4}\) 3\. \(\left[\mathrm{NiCl}_{4}\right]^{2-}\) 4\. \(\left[\mathrm{PdCl}_{4}\right]^{2-}\) (a) 1 and 4 (b) 1 and 2 (c) 2 and 3 (d) 3 and 4

Among the following species the ones having square planar geometry for central atom are 1\. \(\mathrm{XeF}_{4}\) 2\. \(\mathrm{SF}_{4}\) 3\. \(\left[\mathrm{NiCl}_{4}\right]^{2-}\) 4\. \(\left[\mathrm{PdCl}_{4}\right]^{2-}\) (a) 1 and 4 (b) 1 and 2 (c) 2 and 3 (d) 3 and 4

Which of the following statement is not correct regarding the properties of ionic compounds? (a) ionic compounds have high melting and boiling points (b) their reaction velocity in aqueous medium is very high. (c) ionic compounds in their molten and aqueous solutions do not conduct electricity. (d) they are highly soluble in polar solvents.

Identify the correct sequence of increasing number of \(\pi\) bonds in the structures of the following molecules 1\. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{6}\) 2\. \(\mathrm{H}_{2} \mathrm{SO}_{3}\) 3\. \(\mathrm{H}_{2} \mathrm{~S}_{2} \mathrm{O}_{5}\) (a) \(1,2,3\) (b) \(2,3,1\) (c) \(2,1,3\) (d) \(1,3,2\)

If the molecule of HCl was totally polar, the expected value of dipole moment was \(6.12 \mathrm{D}\) but the experimental value of dipole moment calculated was 1.03 D. Calculate the percentage ionic character. (a) 0 (b) 17 (c) 50 (d) 90

The correct order of the lattice energies for the following ionic compounds is (a) \(\mathrm{Al}_{2} \mathrm{O}_{3}>\mathrm{CaO}>\mathrm{MgBr}_{2}>\mathrm{NaCl}\) (b) \(\mathrm{MgBr}_{2}>\mathrm{Al}_{2} \mathrm{O}_{3}>\mathrm{CaO}>\mathrm{NaCl}\) (c) \(\mathrm{Al}_{2} \mathrm{O}_{3}>\mathrm{MgBr}_{2}>\mathrm{CaO}>\mathrm{NaCl}\) (d) \(\mathrm{NaCl}>\mathrm{MgBr}_{2}>\mathrm{CaO}>\mathrm{Al}_{2} \mathrm{O}_{3}\)

Which of the following is correct? (a) The rate of ionic reactions are very slow (b) The number of electrons present in the valence shell of \(\mathrm{S}\) in \(\mathrm{SF}_{6}\) is 12 (c) According to VSEPR theory \(\mathrm{SnCl}_{2}\) is a linear molecule (d) The correct order of stability to form ionic compounds among \(\mathrm{Na}^{+}, \mathrm{Mg}^{2+}\) and \(\mathrm{Al}^{3+}\) is \(\mathrm{Al}^{3+}>\) \(\mathrm{Mg}^{2+}>\mathrm{Na}^{+}\)

Bond order of nitric oxide is (a) 1 (b) \(2.5\) (c) 2 (d) \(1.5\)

The decreasing order of the boiling points of the following hydrides is 1\. \(\mathrm{NH}_{3}\) 2\. \(\mathrm{PH}_{3}\) 3\. \(\mathrm{AsH}_{3}\) 4\. \(\mathrm{SbH}_{3}\) 5\. \(\mathrm{H}_{2} \mathrm{O}\) (a) \(5>4>1>3>2\) (b) \(5>1>2>3>4\) (c) \(2>4>3>1>5\) (d) \(4>3>1>2>5\)

Which of the following are isoelectronic and isostructural? \(\mathrm{NO}_{3}^{-}, \mathrm{CO}_{3}^{-2}, \mathrm{ClO}_{3}-\mathrm{SO}_{3}\) (a) \(\mathrm{NO}_{3}^{-}, \mathrm{CO}_{3}^{-2}\) (b) \(\mathrm{SO}_{3}, \mathrm{NO}_{3}^{-}\) (c) \(\mathrm{ClO}_{3}^{-}, \mathrm{CO}_{3}^{-2}\) (d) \(\mathrm{CO}_{3}^{-2}, \mathrm{SO}_{3}\)

Among the following, the molecule with the highest dipole moment is (a) \(\mathrm{CH}_{3} \mathrm{Cl}\) (b) \(\mathrm{CH}_{2} \mathrm{Cl}_{2}\) (c) \(\mathrm{CHCl}_{3}\) (d) \(\mathrm{CCl}_{4}\)

The nodal plane in the \(\pi\) bond of ethene is located in (a) the molecular plane. (b) a plane parallel to the molecular plane. (c) a plane perpendicular to the molecular plane which bisects. The carbon- carbon \(\sigma\) bond at right angle. (d) a plane perpendicular to the molecular plane which contains the carbon- carbon bond.

Specify the coordination geometry and hybridization of \(\mathrm{N}\) and \(\mathrm{B}\) atoms in a \(1: 1\) complex of \(\mathrm{BF}_{3}\) and \(\mathrm{NH}_{3}\) (a) \(\mathrm{N}\) : tetrahedral, sp ; B: tetrahedral, sp \(^{3}\) (b) N: pyramidal, sp'; B: pyramidal, sp \(^{3}\) (c) N: pyramidal, sp \(^{3} ;\) B: planar, sp \(^{2}\) (d) \(\mathrm{N}\) : pyramidal, \(\mathrm{sp}^{3} ; \mathrm{B}:\) tetrahedral, \(\mathrm{sp}^{3}\)