Chapter 13

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

Sulphur reacts with chlorine in \(1: 2\) ratio and forms X. Hydrolysis of \(X\) gives a sulphur compound Y. What is the hybridization state of central atom in the anion of \(Y\) ? (a) \(\mathrm{sp}^{3}\) (b) \(\mathrm{sp}\) (c) \(\mathrm{sp}^{2}\) (d) \(\mathrm{sp}^{3} \mathrm{~d}\)

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) \(\mathrm{BeCl}_{2}\)

Which of the following represents the Lewis structure of \(\mathrm{N}_{2}\) molecule? (a) \({ }_{x}^{x} \mathrm{~N} \equiv \mathrm{N}_{x}^{\mathrm{x}}\) (b) \({ }_{\mathrm{x}}^{\mathrm{x}} \mathrm{N} \equiv \mathrm{N}_{\mathrm{x}}^{\mathrm{x}}\) (c) \({ }_{\mathrm{x}}^{\mathrm{x}} \mathrm{N}_{x \mathrm{x}} \equiv \mathrm{N}_{\mathrm{x}}^{\mathrm{xx}} \mathrm{x}^{\mathrm{x}}\) (d) \({ }_{x}^{x}{\underline{\phantom{xx}}}_{x}^{x x}-\underset{x x}{N}-\stackrel{x x}{x}\)

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) \(\mathrm{He}_{2}^{+}\)

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

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) \(103^{\circ}\)

The paramagnetism of \(\mathrm{O}_{2}^{+}\)is due to the presence of an odd electron in the MO (a) \(\sigma^{*} 2 \mathrm{~s}\) (b) \(\pi 2 \mathrm{py}\) (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) \(\mathrm{dsp}^{2}, \mathrm{sp}^{3}, \mathrm{sp}^{2}, \mathrm{sp}^{3} \mathrm{~d}\)

The hybridization of atomic orbitals of nitrogen in \(\mathrm{NO}_{2}^{+}, \mathrm{NO}_{3}^{-}\)and \(\mathrm{NH}_{4}^{+}\)are (a) \(\mathrm{sp}^{2}\), \(\mathrm{sp}^{3}\) and \(\mathrm{sp}^{2}\) respectively (b) \(\mathrm{sp}, \mathrm{sp}^{2}\) and \(\mathrm{sp}^{3}\) respectively (c) \(\mathrm{sp}^{2}, \mathrm{sp}\) and \(\mathrm{sp}^{3}\) respectively (d) \(\mathrm{sp}^{2}, \mathrm{sp}^{3}\) and sp respectively

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) \(\mathrm{CO}\)

Among the following compounds the one that is polar and has the central atom with sp \(^{2}\) 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) CIF (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 \(\mathrm{N}_{2}+\)

Which of the following statements is not correct for \(\sigma\) and \(\pi\) bonds which is formed between two carbon atoms? (a) free rotation of atoms about \(\sigma\) bond is allowed but not in case of a \(\pi\) bond (b) \(\sigma\) bond determines the direction between carbon atoms but a \(\pi\) bond has no primary effect in this regard (c) \(\sigma\) bond is stronger than a \(\pi\) bond (d) bond energies of \(\sigma\) bond and \(\pi\) bond are of the order of \(264 \mathrm{~kJ} / \mathrm{mol}\) and \(347 \mathrm{~kJ} / \mathrm{mol}\), respectively

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

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) \(\mathrm{BeCl}_{2}<\mathrm{NaCl}<\mathrm{LiCl}\)

The correct order in which the O-O bond length increases in the following is (a) \(\mathrm{O}_{2}<\mathrm{H}_{2} \mathrm{O}_{2}<\mathrm{O}_{3}\) (b) \(\mathrm{O}_{3}<\mathrm{H}_{2} \mathrm{O}_{2}<\mathrm{O}_{2}\) (c) \(\mathrm{H}_{2} \mathrm{O}_{2}<\mathrm{O}_{2}<\mathrm{O}_{3}\) (d) \(\mathrm{O}_{2}<\mathrm{O}_{3}<\mathrm{H}_{2} \mathrm{O}_{2}\)

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.

If the molecule of \(\mathrm{HCl}\) 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) \(\mathrm{NaCl}>\mathrm{MgBr}_{2}>\mathrm{CaO}>\mathrm{Al}_{2} \mathrm{O}_{3}\)

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

The correct order of bond angle of \(\mathrm{NO}_{2}^{+}, \mathrm{NO}_{2}\) and \(\mathrm{NO}_{2}\) is (a) \(\mathrm{NO}_{2}^{+}<\mathrm{NO}_{2}<\mathrm{NO}_{2}^{-}\) (b) \(\mathrm{NO}_{2}^{+}=\mathrm{NO}_{2}^{-}<\mathrm{NO}_{2}\) (c) \(\mathrm{NO}_{2}^{+}>\mathrm{NO}_{2}^{-}>\mathrm{NO}_{2}\) (d) \(\mathrm{NO}_{2}^{\top}>\mathrm{NO}_{2}<\mathrm{NO}_{2}^{-}\)

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) \(4>3>1>2>5\)

The sequence that correctly describes the relative bond strength pertaining to oxygen molecule and its cation or anion is (a) \(\mathrm{O}_{2}^{2->} \mathrm{O}_{2}^{->} \mathrm{O}_{2}>\mathrm{O}_{2}^{+}\) (b) \(\mathrm{O}_{2}>\mathrm{O}_{2}^{+}>\mathrm{O}_{2}^{-}>\mathrm{O}_{2}^{2-}\) (c) \(\mathrm{O}_{2}^{2}>\mathrm{O}_{2}>\mathrm{O}_{2}^{2-}>\mathrm{O}_{2}^{-}\) (d) \(\mathrm{O}_{2}^{2}>\mathrm{O}_{2}>\mathrm{O}_{2}^{->}>\mathrm{O}_{2}^{2}\)

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) N: tetrahedral, sp; B: tetrahedral, sp \(^{3}\) (b) N: pyramidal, sp \(^{3} ;\) B: pyramidal, sp \(^{3}\) (c) \(\mathrm{N}\) : pyramidal, \(\mathrm{sp}^{3} ; \mathrm{B}\) : planar, \(\mathrm{sp}^{2}\) (d) N: pyramidal, sp \(^{3} ;\) B: tetrahedral, sp \(^{3}\)

The common features among the species \(\mathrm{CN}^{-}, \mathrm{CO}\) and \(\mathrm{NO}^{+}\)are (a) bond order three and isoelectronic (b) bond order three and weak field ligands (c) bond order two and \(\pi\)-acceptors (d) isoelectronic and weak field ligands.

The correct order of increasing \(\mathrm{C}-\mathrm{O}\) bond length of \(\mathrm{CO}, \mathrm{CO}_{3}^{2-}, \mathrm{CO}_{2}\) is (a) \(\mathrm{CO}_{3}^{2-}<\mathrm{CO}_{2}<\mathrm{CO}\) (b) \(\mathrm{CO}_{2}<\mathrm{CO}_{3}^{2^{2}}<\mathrm{CO}\) (c) \(\mathrm{CO}<\mathrm{CO}_{3}^{2}-\mathrm{CO}_{2}\) (d) \(\mathrm{CO}<\mathrm{CO}_{2}<\mathrm{CO}_{3}^{2-}\)

KF combines with HF to form \(\mathrm{KHF}_{2} .\) The compound contains the species (a) \(\mathrm{K}^{+}, \mathrm{F}^{-}\)and \(\mathrm{H}^{+}\) (b) \(\mathrm{K}^{+}, \mathrm{F}^{-}\)and \(\mathrm{HF}\) (c) \(\mathrm{K}^{+}\)and \(\left[\mathrm{HF}_{2}\right]^{-}\) (d) \([\mathrm{KHF}]^{+}\)and \(\mathrm{F}_{2}\)

The following compounds are to be arranged in order of their increasing thermal stabilities. Identify the correct order. 1\. \(\mathrm{K}_{2} \mathrm{CO}_{3}\) 2\. \(\mathrm{MgCO}_{3}\) 3. \(\mathrm{CaCO}_{3}\) 4\. \(\mathrm{BeCO}_{3}\) (a) \(1<2<3<4\) (b) \(4<2<3<1\) (c) \(4<2<1<3\) (d) \(2<4<3<1\)

Among the following species, identify the isostructural pairs \(\mathrm{NF}_{3}, \mathrm{NO}_{3}^{-}, \mathrm{BF}_{3}, \mathrm{H}_{3} \mathrm{O}^{+}, \mathrm{HN}_{3}\) (a) \(\left[\mathrm{NF}_{3}, \mathrm{NO}_{3}^{-}\right]\)and \(\left[\mathrm{BF}_{3}, \mathrm{H}_{3} \mathrm{O}^{+}\right]\) (b) \(\left[\mathrm{NF}_{3}, \mathrm{HN}_{3}\right]\) and \(\left[\mathrm{NO}_{3}^{-}, \mathrm{BF}_{3}\right]\) (c) \(\left[\mathrm{NF}_{3}, \mathrm{H}_{3} \mathrm{O}^{+}\right]\)and \(\left[\mathrm{NO}_{3}^{-}, \mathrm{BF}_{3}\right]\) (d) \(\left[\mathrm{NF}_{3}, \mathrm{H}_{3} \mathrm{O}^{+}\right]\)and \(\left[\mathrm{HN}_{3}, \mathrm{BF}_{3}\right]\)

Which type of bond is not present in HNO \(_{2}\) molecule? (a) covalent (b) coordinate (c) ionic (d) ionic as well as coordinate