Chapter 13

Which one of the following molecules will form a linear polymeric structure due to hydrogen bonding? (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{H}_{2} \mathrm{O}\) (c) \(\mathrm{HCl}\) (d) HF

Among the following the electron deficient compound is (a) \(\mathrm{BCl}_{3}\) (b) \(\mathrm{CCl}_{4}\) (c) \(\mathrm{PCl}_{5}\) (d) \(\mathrm{CH}_{4}\)

Among the following ions the \(\mathrm{p} \pi-\mathrm{d} \pi\) overlap could be present in (a) \(\mathrm{NO}_{2}^{-}\) (b) \(\mathrm{NO}^{-}=\) (c) \(\mathrm{PO}_{4}^{3-}\) (d) \(\mathrm{CO}_{3}^{2}\)

Which one of the following is not paramagnetic? (a) \(\mathrm{NO}\) (b) \(\mathrm{N}_{2}^{+}\) (c) \(\mathrm{CO}\) (d) \(\mathrm{O}_{2}^{-}\)

Cation and anion combines in a crystal to form following type of compound. (a) ionic (b) metallic (c) covalent (d) dipole-dipole

Which of the following two are isostructural? (a) \(\mathrm{XeF}_{2}, \mathrm{IF}_{2}^{-}\) (b) \(\mathrm{NH}_{3}, \mathrm{BF}_{3}\) (c) \(\mathrm{CO}_{3}^{2-}, \mathrm{SO}_{3}^{2-}\) (d) \(\mathrm{PCl}_{5}, \mathrm{ICl}_{5}\)

Main axis of a diatomic molecule is z, molecule orbitals \(\mathrm{p}_{x}\) and \(\mathrm{p}_{\mathrm{y}}\) overlap to form, which of the following orbital? (a) \(\pi\) molecular orbital (b) \(\sigma\) molecular orbital (c) \(\delta\) molecular orbital (d) no bond will form

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

Which of the following has \(\mathrm{p} \pi-\mathrm{d} \pi\) bonding? (a) \(\mathrm{NO}_{3}^{-}\) (b) \(\mathrm{SO}_{3}^{2-}\) (c) \(\mathrm{BO}_{3}^{3-}\) (d) \(\mathrm{CO}_{3}^{2-}\)

In \(\mathrm{NO}_{3}^{-}\)ion, number of bond pair and lone pair of electron on nitrogen atom are? (a) 2,2 (b) 3,1 (c) 1,3 (d) 4,0

In a regular octahedral molecule, \(\mathrm{MX}_{6}\) the number of X-M-X bonds at an angle of \(180^{\circ}\) is (a) three (b) two (c) \(\operatorname{six}\) (d) four

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 \(\mathrm{SF}_{6}\)

In an octahedral structure, the pair of \(\mathrm{d}\) orbitals involved in \(\mathrm{d}^{2} \mathrm{sp}^{3}\) hybridization is (a) \(\mathrm{d}_{x^{2}-y^{2}}, \mathrm{~d}_{z^{2}}\) (b) \(\mathrm{d}_{x x}, \mathrm{~d}_{x^{2}-y^{2}}\) (c) \(\mathrm{d}_{z}=\mathrm{d}_{x z}\) (d) \(\mathrm{d}_{\mathrm{xy}}, \mathrm{d}_{y z}\)

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

Which of the following molecules has trigonal planar geometry? (a) \(\mathrm{BF}_{3}\) (b) \(\mathrm{NH}_{3}\) (c) \(\mathrm{PCl}_{3}\) (d) \(\mathrm{IF}_{3}\)

Which of the following would have a permanent dipole moment? (a) \(\mathrm{SiF}_{4}\) (b) \(\mathrm{SF}_{4}\) (c) \(\mathrm{XeF}_{4}\) (d) \(\mathrm{BF}_{3}\)

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) \(\mathrm{BF}_{3}\)

Which of the following species has a linear shape? (a) \(\mathrm{NO}_{2}^{+}\) (b) \(\mathrm{O}_{3}\) (c) \(\mathrm{NO}_{2}^{-}\) (d) \(\mathrm{SO}_{2}\)

Which of the following is not isostructural with \(\mathrm{SiCl}_{4} ?\) (a) \(\mathrm{PO}_{4}^{3-}\) (b) \(\mathrm{NH}_{4}^{+}\) (c) \(\mathrm{SCl}_{4}\) (d) \(\mathrm{SO}_{4}^{2-}\)

The ratio of \(\pi\) and \(\sigma\) bonds in benzene is (a) \(1: 2\) (b) \(1: 4\) (c) \(1: 6\) (d) \(1: 6\)

The bond length between \(\mathrm{C}-\mathrm{C}\) bond in \(\mathrm{sp}^{3}\) hybridized molecule is (a) \(1.2 \AA\) (b) \(1.39 \AA\) (c) \(1.33 \AA\) (d) \(1.54 \AA\)

The planar structure of \(\mathrm{BF}_{3}\) can be explain by the fact that \(\mathrm{BF}_{3}\) is (a) sp hybridized (b) sp \(^{2}\) hybridized (c) sp \(^{3}\) hybridized (d) sp \(^{3}\) hybridized

Dipole moment is shown by (a) 2 -methyl propane (b) trans-2-butene (c) cis-2-butene (d) carbon tetrachloride

\(\mathrm{O}_{2}^{2+}\) has a bond order of (a) 1 (b) 2 (c) 3 (d) 4

In 1,3 -butadiene, the carbon is hybridized as (a) sp (b) \(\mathrm{sp}^{2}\) (c) \(\mathrm{sp}^{3}\) (d) \(s p^{2}\) and \(s p^{3}\)

The most polar covalent species among the ones listed is (a) \(\mathrm{C}-\mathrm{S}\) (b) \(\mathrm{C}-\mathrm{O}\) (c) \(\mathrm{C}-\mathrm{F}\) (d) \(\mathrm{C}-\mathrm{Br}\)

Correct order of polarizing power is (a) \(\mathrm{Cs}^{+}<\mathrm{K}^{+}<\mathrm{Mg}^{2+}<\mathrm{Al}^{3+}\) (b) \(\mathrm{K}^{+}<\mathrm{Cs}^{+}<\mathrm{Mg}^{2+}<\mathrm{Al}^{3+}\) (c) \(\mathrm{Cs}^{+}<\mathrm{K}^{+}<\mathrm{Al}^{3+}<\mathrm{Mg}^{2+}\) (d) \(\mathrm{K}^{+}<\mathrm{Cs}^{+}<\mathrm{Al}^{3+}<\mathrm{Mg}^{2+}\)

Hybridization of 1 and 2 carbon atom in \({ }^{1} \mathrm{CH}_{2}={ }^{2} \mathrm{C}=\mathrm{CH}_{2}\) are (a) \(\mathrm{sp}, \mathrm{sp}\) (b) \(s p^{2}, s p^{2}\) (c) \(\mathrm{sp}^{2}\), sp (d) \(\mathrm{sp}^{3}, \mathrm{sp}^{2}\)

Which of the following molecules contains one lone pair of electrons on the central atom? (a) \(\mathrm{NH}_{3}\) (b) \(\mathrm{CH}_{4}\) (c) \(\mathrm{CHCl}_{2}\) (d) \(\mathrm{Cl}_{2}\)

The molecule having highest bond energy is (a) \(\mathrm{N}-\mathrm{N}\) (b) \(\mathrm{F}-\mathrm{F}\) (c) \(\mathrm{C}-\mathrm{C}\) (d) \(\mathrm{O}-\mathrm{O}\)

The halide having the highest melting point is (a) \(\mathrm{NaF}\) (b) \(\mathrm{NaCl}\) (c) \(\mathrm{NaBr}\) (d) \(\mathrm{NaI}\)

Born-Haber cycle is used to determine (a) electron affinity (b) lattice energy (c) crystal energy (d) all the above

The number of \(\sigma\) and \(\pi\)-bonds present in pent-1ene- 4 -yne is (a) 3,10 (b) 9,4 (c) 4,9 (d) 10,3

Intermolecular hydrogen bonding is strongest in (a) methylamine (b) phenol (c) formaldehyde (d) methanol

\(\mathrm{BaSO}_{4}\) is insoluble in water because of (a) low hydration energy (b) low lattice energy (c) high lattice energy (d) both (a) and (c)

Acetylene has ........ bonds (a) \(2 \sigma, 2 \pi\) (b) \(2 \sigma, 3 \pi\) (c) \(3 \sigma, 2 \pi\) (d) \(3 \sigma, 3 \pi\)

Both \(\mathrm{BF}_{3}\) and \(\mathrm{NF}_{3}\) are covalent but \(\mathrm{BF}_{3}\) molecule is non-polar while \(\mathrm{NF}_{3}\) is polar because (a) atomic size of boron is smaller than nitrogen (b) \(\mathrm{BF}_{3}\) is planar but \(\mathrm{NF}_{3}\) is pyramidal (c) boron is a metal while nitrogen is gas (d) BF bond has no dipole moment while NF bond has dipole

The boiling point of alcohol is high due to (a) hydrogen bonding (b) large size of alcohol (c) presence of -OH group (d) high molecular weight

The hybridization of I in IF \(_{3}\) is (a) \(\mathrm{sp}^{3} \mathrm{~d}\) (b) \(\mathrm{sp}^{3}\) (c) \(\mathrm{sp}^{3} \mathrm{~d}^{2}\) (d) \(\mathrm{sp}^{3} \mathrm{~d}^{3}\)

What is the number of sigma and pi bonds present in a molecule of sulphuric acid? (a) \(6 \sigma, 2 \pi\) (b) \(6 \sigma, 0 \pi\) (c) \(2 \sigma, 4 \pi\) (d) \(2 \sigma, 2 \pi\)

The shape of \(\mathrm{IF}_{7}\) molecule is (a) pentagonal bipyramidal (b) trigonal pyramidal (c) tetrahedral (d) square planar

The highest dipole moment is of (a) \(\mathrm{CF}_{4}\) (b) \(\mathrm{CH}_{3} \mathrm{OH}\) (c) \(\mathrm{CO}_{2}\) (d) \(\mathrm{CH}_{3} \mathrm{~F}\)

The most polar bond is (a) \(\mathrm{C}-\mathrm{F}\) (b) \(\mathrm{C}-\mathrm{O}\) (c) \(\mathrm{C}-\mathrm{Br}\) (d) \(\mathrm{C}-\mathrm{S}\)

Which one of the following is the correct set with reference to molecular formula, hybridization of central atom and shape of the molecule? (a) \(\mathrm{CO}_{2}, \mathrm{sp}^{2}\), bent (b) \(\mathrm{H}_{2} \mathrm{O}, \mathrm{sp}^{2}\), bent (c) \(\mathrm{BeCl}_{2}, \mathrm{sp}\), linear (d) \(\mathrm{H}_{2} \mathrm{O}, \mathrm{sp}^{3}\), linear

What is the hybridization state of the central atom in the conjugate base of \(\mathrm{NH}_{4}^{+}\)ion? (a) sp (b) \(\mathrm{sp}^{3}\) (c) \(\mathrm{sp}^{3}\) (d) \(\mathrm{dsp}^{2}\)

Which one of the following molecules contains both ionic and covalent bonds? (a) \(\mathrm{CH}_{2} \mathrm{Cl}_{2}\) (b) \(\mathrm{K}_{2} \mathrm{SO}_{4}\) (c) \(\mathrm{BeCl}_{2}\) (d) \(\mathrm{SO}_{2}\)

Which one of the following is a correct set with respect to molecule, hybridization and shape? (a) \(\mathrm{BeCl}_{2}, \mathrm{sp}^{2}\), linear (b) \(\mathrm{BeCl}_{2}, \mathrm{sp}^{2}\), triangular planar (c) \(\mathrm{BCl}_{3}, \mathrm{sp}^{2}\), triangular planar (d) \(\mathrm{BCl}_{3}, \mathrm{sp}^{3}\), tetrahedral

Which of the following shows isostructural species? (a) \(\mathrm{NH}_{4}^{+}\)and \(\mathrm{NH}_{2}^{-}\) (b) \(\mathrm{CH}_{3}^{-}\)and \(\mathrm{CH}_{3}^{+}\) (c) \(\mathrm{SO}_{4}^{2-}, \mathrm{PO}_{4}^{3-}\) and \(\left[\mathrm{BF}_{4}-\right]\) (d) \(\mathrm{NH}_{4}^{+}\)and \(\mathrm{NH}_{3}\)

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) \(\mathrm{CCl}_{4}\)