Chemical Bonding And Molecular Structure – I

1) The ionic radius of Be2+ is comparable to that of
a) Li+
b) Mg2+
c) AI3+
d) Ca2+

2) On the basis of the valencies of the elements in a group, the formula of the compound formed by tin with fluorine is
a) SnF
b)
c)
d)

3) N2 and O2 are converted into the mono-anions, respectively. Which of the following statements is wrong?
a) In N2 the N-N bond weakens
b)
c) In O2- the O-O bond order decreases
d)

4) For two ionic solids, CaO and KI, identify the wrong statement among the following.
a) The latttice energy of CaO is much larger than that KI
b) KI is soluble in benzene
c) CaO has a higher melting point
d) KI has a lower melting point.

5) The molecule is trigonal bipyramidal. The hybrid orbitals used by the As atoms for bonding are
a)
b)
c)
d)

6) N2 and O2 are converted into mono cations, respectively. Which of the following is wrong?
a)
b)
c) In O2+ , paramagnetism decreases
d)

7) The high density of water compared to ice is due to
a) H-bonding interactions
b) Dipole-dipole interactions
c) Dipole-induced dipole interactions
d) Induced dipole- induced dipole interactions

8) An element (X) forms compounds of the formulaXCl3,X2O5 and Ca3X2, but does not form . Which of the following is the element X?
a) B
b) Al
c) N
d) P

9) Which has the least bond angle?
a)
b)
c)
d)

10) The hybridization of the S atom in is
a) sp
b)
c)
d)

11) The correct order of decreasing polarisability of ions is
a)
b)
c)
d)

12) Which of the following molecules is paramagnetic?
a)
b)
c)
d)

13) Among the following which one is paramagnetic? (Atomic numbers: Be=4, Ne=10, As=33,Cl=17)
a)
b)
c)
d)

14) A metallic bond is
a) Ionic
b) Polar covalent
c) Non-polar covalent
d) Electrostatic in nature

15) The dipole moment of is zero which implies that
a) Carbon and oxygen have equal electronegativities
b) Carbon has no polar bond
c)
d) Carbon has bond moments of zero value.

16) The metallic lustre exhibited by sodium is explained by the
a) diffusion of sodium ions
b) Excitation of free protons
c) Oscillation of loose electrons
d) Existence of a body-centered cubic lattic

17) The average distance of a single covalent bond of carbon and oxygen is
a)
b)
c)
d)

18) Which of the following ion does not have a bond order of 2.5?
a) O22-
b)
c)
d)

19) Which of the following has the least polarity in its bond?
a) H-F
b) H-F
c) H-O
d) H-S

20) Which of the following statements regarding covalent bonding is not true?
a) The electrons are shared between atoms
b) The bond is non-directional
c) The strength of the bond depends on the extent of overlapping
d) The bond formed may or may not be polar

21) The number of electrons shared in each outermost shell of is
a) 2
b) 3
c) 4
d) 5

22) The electronic configuration of a metal M is . The formula of its oxide will be
a) MO
b)
c)
d)

23) The compound containing a co-ordinate bond is
a)
b)
c)
d) all of these

24) Which of the following will be octahedral?
a)
b)
c)
d)

25) The number of anti bonding electron pairs in the molecular ion on the basis of the molecular orbital theory(at no. of O=8) is
a) 2
b) 3
c) 4
d) 5

26) The correct order of increasing C-O bond length of CO, is
a)
b)
c)
d)

27) Bonding is electrovalent in
a) NaCl
b)
c)
d)

28) The oxygen molecule is
a) Diamagnetic with no unpaired electrons
b) Diamagnetic with two unpaired electrons
c) paramagnetic with two unpaired electrons
d) Paramagnetic with no unpaired electrons

29) The hybridization of the atomic orbitals of nitrogen in NO2 +, NO3- and NH4 are
a) sp2, sp3 and sp respectively
b) sp, sp2 and sp3 respectively
c) sp2, sp and sp3 respectively
d) sp2, sp3 and sp respectively

30) The compound which does not contain an ionic bond is
a) NaOH
b) HCl
c)
d) LiH

31) Which of the following statements concerning ionic compound is false?
a) They consist of ions
b) They generally have high melting and boiling points
c) They are good conductors at room temperature
d) They are generally soluble in polar solvents

32) In which of the following solvents does KI have highest solubility? The dielectric constant of each liquid is given in parentheses:
a)
b)
c)
d)

33) Ionic compounds in general possess both
a) High melting point and non-directional bonds
b) High melting points and low boiling points
c) Directional bonds and low boiling points
d) High solubilities in polar and non-polar solvents

34) An electrovalent compound does not exhibit space isomerism because of the
a) Presence of oppositely charged ions
b) High melting points
c) Non-directional nature of the bond
d) Crystalline nature

35) An electrovalent compound is made up of
a) Neutral atoms
b) Neutral molecules
c) Electrically charged atoms or groups of atoms
d) Electrically charged molecules

36) A true covalent bond is formed by
a) the transference of electrons from one atom to the other
b) the mutual sharing of electrons
c) One-sided sharing of electrons
d) Any of the above three processes

37) The electron dot representation of covalent molecules is also called
a) Lewisite structure
b)
c) Lewis structure
d)

38) Which of the following statements concerning a covalent bond is false?
a) the electrons are shared between atoms
b) The bond is non-directional
c) The strength of the bond depends upon the extend of overlapping
d) The bond formed may be polar or non-polar

39) Which of the following is not a characteristic of a covalent compound?
a) It has a low melting point and boiling point
b) It is formed between two atoms having no or very small electronegativity difference
c) They have no definite geometry
d) They are generally insoluble in water.

40) Which of the following statements is incorrect?
a) sodium hydride is ionic
b) Beryllium chloride is covalent
c)
d) The bonds in NaCl are non-directional

41) Which of the following statements about LiCl and NaCl is wrong?
a) LiCl has lower melting point than NaCl
b) LiCl dissolves more in organic solvents whereas NaCl does not
c) LiCl would ionise in water more than NaCl
d) Fused LiCl would be less conducting than fused NaCl

42) Which of the following when dissolved in water forms a solution which is non conducting?
a) Green vitriol
b) Chile or Indian salt petre
c) Alcohol
d) Potash alum

43) The compound which contains ionic as well as covalent bonds is
a)
b)
c)
d)

44) A covalent bond may be formed by
a) s-s overlap
b) s-p overlap
c) p-p overlap
d) all the three

45) Lateral overlap of p-orbitals leads to the formation of
a) a
b) a metallic bond
c) a
d) an ionic bond

46) The fluorine molecule is formed by
a) p-p orbitals(sideways overlap)
b) p-p orbitals(end-to-end overlap)
c) sp-sp orbitals
d) s-s orbitals

47) The strength of bonds formed by 2s-2s, 2p-2p and 2p-2s overlap has the order
a) s-s >p-p> p-s
b) s-s> p-s> p-p
c) p-p> p-s> s-s
d) p-p> s-s > p-s

48) Which of the following will provide the most efficient overlap?
a) s-s
b) s – p
c)
d) sp –sp

49) Which of the following statements is correct?
a)
b)
c) The covalent bond is directional in nature
d) HF is less polar than HCl

50) In which of the following species are the bonds non-directional?
a)
b)
c)
d)

51) The compound, 1,2-butadiene has
a) only sp hybrid carbon atoms
b)
c)
d)

52) In the electronic structure of acetic acid there are
a) 16 shared and 8 unshared electrons
b) 8 shared and 16 unshared electrons
c) 12 shared and 12 unshared electrons
d) 18 shared and 6 unshared electrons

53) Which of the following does not have a coordinate bond?
a)
b)
c)
d)

54) In an ionic compound, the degree of covalent bonding is greatest when
a)
b)
c)
d)

55) Which of the following has the highest ionic character?
a)
b)
c)
d)

56) Which of the following chlorides has considerable covalent character?
a) LiCl
b) NaCl
c) KCl
d) CsCl

57) In which of the following molecules are the van der Waals forces likely to be the most important in determining the melting and boiling points?
a) CO
b)
c)
d) HCl

58) Which is distilled first?
a)
b)
c)
d)

59) At ordinary temperature and pressure among halogens, chlorine is a gas, bromine is a liquid and iodine is a solid. This is because
a)
b) Intermolecular forces among molecules of chlorine are weakest and those of iodine the strongest
c)
d)

60) Intermolecular forces in solid hydrogen or argon are
a) electrostatic forces
b) hydrogen bonds
c) van der Waal’s forces
d) metallic bonds

61) An atom x has three valence electrons and the atom Y has six valence electrons. The compound formed between them will have the formula
a)
b)
c)
d)

62) Any one of the three equivalent resonance forms for the ion would show … around the carbon atom.
a) three single bonds
b) two single bonds and a double bond
c) three single bonds and one lone pair of electrons
d) two single bonds and two lone pairs of electrons

63) The carbon monoxide molecule may be represented by any of the following structures except
a)
b)
c)
d)

64) A molecule may be represented by three structures having energies respectively. The energies of these structures follow the order, respectively. If the experimental bond energy of the molecule is , the resonance energy is
a)
b)
c)
d)

65) Which of the following resonating structures is not correct for ?
a)
b)
c)
d)

66) The weakest bond among the following is
a) ionic
b) covalent
c) metallic
d) the hydrogen bond

67) Which of the following is not true about resonance?
a) The resonating structures are hypothetical
b) The unpaired electrons in various resonating structures are the same
c) the hybrid structure is the least stable
d) the hybrid structure is the least energetic

68) Resonance structures can be written for
a)
b)
c)
d)

69) H- bonding is exhibited by
a) All the molecules containing H- atoms
b) Molecules in which H is covalently bonded to F,O, or N
c) Molecules in which two H atoms are present
d) Molecules in which H is bonded to atoms with electronegativity greater than 2.1

70) The boiling point is not affected by hydrogen bonding in
a) water
b) ammonia
c) methyl alcohol
d) Hydrogen chloride

71) The correct order of the strength of the H -bond is
a) HÂ…..F>HÂ….O > HÂ…N
b) HÂ…N > HÂ….O > HÂ….F
c) HÂ…O > HÂ…..N > HÂ…..F
d) HÂ…F >HÂ….N > HÂ….O

72) In ice, the length of H- bonds
a) is less than that of covalent bonds
b) is greater than that of covalent bonds
c) is same as that of covalent bonds
d) can be less, greater or same as that of covalent bonds

73) There is no hydrogen bonding in
a) Acetic acid
b) Ammonia
c) Ethyl alcohol
d) Diethyl ether

74) Which of the following compounds has the least tendency to form hydrogen bonds?
a) HF
b)
c) HCl
d)

75) The boiling points of methanol, water and dimethyl ether are respectively . Which of the following best explains these wide variations in b. p.?
a) The molecular mass increases from water (18) to methanol(32) to diethyl ether(74)
b) The extent of H-bonding decreases from water to methanol while it is absent in ether
c) The extent of intra-molecular H-bonding decreases from ether to methanol to water
d) The number of H atoms per molecule increases from water to methanol to ether

76) The crystal lattice of ice is mostly formed by
a) Ionic forces
b) Covalent bonds
c) Intramolecular H-bonds
d) Covalent bonds as well as H- bonds

77) Out of the two compounds given below, the vapour pressure of compound b at a particular temperature is expected to be

a) Higher than that of a
b) Lower than that of a
c) Same as that of a
d) Can be higher or lower depending upon the size of the vessel

78) The highest viscosity is exhibited by
a) Glycerol
b) Ethylene glycol
c) Ethanol
d) Water

79) Intermolecular H- bonding is present in
a) o-nitrophenol
b) salicylaldehyde
c) m-nitrophenol
d) Both (a) and (b)

80) The boiling point of whereas that of hydrogen sulphide is . This can be attributed to
a) a larger bond angle in H2O than H2S
b) smaller size of the oxygen atom as compared to sulphur
c) Larger ionization energy of oxygen than sulphur
d)

81) Which of the following compounds has the least tendency to form hydrogen bonds between molecules?
a)
b)
c)
d)

82) Hydrogen fluoride is a liquid unlike other hydrogen halides because
a) HF molecules associate due to hydrogen bonding
b)
c) HF is the weakest acid of all hydrogen halides
d) the fluorine atom is the smallest of all halogens

83) Which one is appreciably soluble in water?
a)
b)
c)
d)

84) The N atom in ion involves the hybridisation
a) sp
b)
c)
d)

85) Two hybrid orbitals have a bond angle of . The percentage of s- character in the hybrid orbital is nearly
a) 25%
b) 33%
c) 50%
d) 66%

86) A hybrid orbital formed from s- and p- orbital can contribute to
a)
b)
c)
d) Cannot be predicted

87) Which carbon is more electronegative?
a)
b)
c)
d) The electron attracting power of C is always same irrespective of its hybrid state.

88) The geometry of hybrid orbitals is
a) linear
b) pentagonal bipyramidal
c) trigonal bipyramidal
d) octahedral

89) Compound in which central atom assumes hybridization is
a)
b)
c)
d)

90) In oxygen has a hybridisation of
a) sp
b)
c)
d) none of these

91) is isostructural with
a)
b)
c)
d)

92) The hybrid state of the C atom in is the same as that of the carbon in
a)
b)
c) Benzene
d) C (diamond)

93) The hybrid state of C in charcoal is
a)
b)
c)
d) no specific state.

94) The shape of the molecule is similar to
a)
b)
c)
d) All

95) The hybrid state in S in is similar to that of
a)
b)
c)
d)

96) Which among the following molecules is not flat?
a)
b)
c)
d)

97) Which of the following will be planar trigonal?
a)
b)
c)
d)

98) In a change from , the hybrid state of P changes from
a)
b)
c)
d)

99) The hybrid state of B in is
a)
b)
c)
d) Not specific

100) The hybridisation of phosphorus in is the same as
a)
b)
c)
d)

 

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