M.C.Qs Chapter 6 first year Chemistry
CHAPTER 6
CHEMICAL BONDING
MCQs
Q.1An ionic
compound A+ B– is most likely to be formed when
(a) The ionization energy of A is high and
electron affinity of B is low
(b) The ionization
energy of A is low and electron affinity of B is high
(c) Both the
ionization energy and electron affinity of B are high
(d) Both the
ionization energy of A and electron affinity of B are low
Q.2The
number of bonds in nitrogen molecules
(a) one and one ( b) one and
two
(c) three sigma only (d)
two and one
Q.3 Which
of the following statements is not correct regarding bonding molecular
orbitals?
(a) bonding molecular orbitals possess less energy than
atomic orbitals from which they are formed
(b) bonding
molecular orbitals have low electron density between the two nuclei
(c) electron in the bonding molecular orbitals
contributes to the attraction between atoms
(d) bonding molecular orbitals are formed when the electron
waves undergo constructive interference
Q.4 Which
of the following molecules has zero dipole moment?
(a)
NH3 (b)
CHCl3 (c) H2O (d)
BF3
Q.5 Which of the hydrogen halides has
the highest percentage of ionic character
(a)HF (b)
HBr (c) HCl (d) HI
Q.6 Which of the following molecules
has unpaired electrons in anti–bonding molecular orbitals
(a)O2 (b) N2 (c) Br2 (d)
F2
Q.7 Which of the following involve
ionic bonding only?
(a) Li3N (b) NaCl (c) NCl3 (d)
O2
Q.8 Which of the following involve
covalent bonding only?
(a) KF (b) KCl (c) CH4 (d)
MgCl2
Q.9 Which of the following molecules
has a net dipole moment?
(a) CO2
(b) CS2 (c) SO2 (d)
CCl4
Q.10 H2S has a net dipole moment
while BeF2 has zero dipole moment,
because
(a) H2S molecule is linear while BeF2 is
angular
(b) H2S molecule is angular, while BeF2
molecule is linear
(c) Fluorine has more electronegativity than
S
(d) Be is more electronegative than S
Q.11 Which
of the following ions has larger ionic radius?
(a) Na+
(b) K+ (c) Mg2+
(d) Al3+
Q.12 Which
of the following bonds is least polar?
(a) H–Se (b) P–Cl (c) H–Cl
(d) N–Cl
Q.13 Which
one has the least bond angle?
(a) NH3 (b) CH4 (c) H2O (d) BF3
Q.14 Coordinate
covalent bonds are formed by
(a) sharing
of electrons (b) donation of electrons
(c) transference
of electrons (d) none
of these
Q.15 Which
of the following molecules would be expected to have zero dipole moment? (a)
H2S (b) PF3 (c) TeF6 (d) H2O
Q.16 The
bond formed between the elements of low ionization energy and elements of high
electron affinity is
(a) ionic (b)
covalent (c) metallic (d) coordinate
Q.17 The
side ways overlap of two–p orbitals to form a bond is called_______
(a) sigma
bond (b) pi-bond
(c) ionic bond (d) covalent
bond
Q.18 The
head overlap of p–orbitals of two atoms give rise to bond called ____
(a) sigma bond (b) pi-bond (c) ionic
bond (d) covalent bond
Q.19 Which
element would be the most electronegative element with
(a) high
ionization energy (IE) and low electron affinity (EA)
(b) low
ionization energy (IE) and high electron affinity (EA)
(c) low
ionization energy and low electron affinity
(d) high
ionization energy and high electron affinity
Q.20 Which
element would be the least electronegative element with
(a) high
I.E. and low E.A. (b) low
I.E. and high E.A.
(c) low
I.E. and low E.A. (d) high I.E. and low E.A.
Q.21 Which
of the following substances has the least ionic character in its bond?
(a) CCl4 (b)
KCl (c) BeCl2 (d) MgCl2
Q.22 Which
of the following best describes ionization energy?
(a) energy needed to remove the most loosely
bound electron from its ground state
(b) it decreases from left to right across a
period
(c) it increases down the periodic table
(d) it is
represented by x + e– x–
+ energy
Q.23 Which one of the following
characteristics is not usually attributed to ionic substances
(a) high melting point (b) deform when struck
(c) crystalline in solid state
(d) well defined three dimensional structure
Q.24 Which of the following bond is
less polar?
(a) B–Cl (b) C–Cl (c) H–I (d) C–I
Q.25 Which type of the orbital
hybridization and geometry is used by the central atom of NH2–?
(a) sp2
hybridization a d trigonal planar
(b) sp
hybridization and tetrahedral geometry
(c) sp2
hybridization and trigonal planar
(d) sp3
hybridization and tetrahedral geometry
Q.26 Which
of the following compounds has most likely been formed by covalent bonding of
atoms
(a) CaF2
(b) MgO (c)
SiH4 (d) NaCl
Q.27 Identify
the compound below which has bonds formed by an overlap of sp and p–orbitals
(a) BF3 (b) BeCl2 (c) NH3
(d) H2O
Q.28 The
most electronegative of these group element is
(a) Na (b) K (c) Li
(d) Cs
Q.29 The
type of bonding in HBr is
(a) ionic (b)
polar covalent
(c) non–polar
covalent (d)
coordinate covalent
Q.30 Which
of the following statement is not correct
(a) sigma bond is weaker than a pi bond
(b) sigma bond is stronger than a pi bond
(c) double bond is stronger than a single
bond
(d) double bond is shorter than a single bond
Q.31 Which
of the following molecules has a pyramidal structure?
(a) CH4 (b) NH3 (c) H2O (d) C2H4
Q.32 The
bond angle in water is
(a) 109.5o (b) 104.5o (c) 107.0o (d) 120o
Q.33 During
the formation of chemical bond, the potential energy of the system
(a) decreases (b) increases (c) does not change (d) none of these
Q.34 H2O
molecule has
(a) no
lone pair (b) one
lone pair (c) two lone pairs (d) none of these
Q.35 NH3
molecule has
(a)
no lone pair (b) one lone pair (c) two lone pairs (d) three lone pairs
Q.36 In
NH3 the covalent bond formed
are due to
(a) s–sp
overlap (b) s–sp2 overlap (c) s–sp3 overlap (d) sp2–sp2 overlap
Q.37 Which
of the following is largest atom
(a) Mg
(b) Be
(c) Sr (d) Ca
Q.38 As
compared to covalent compounds, ionic compounds generally have
(a) low melting points and low boiling points
(b) low melting points and high boiling
points
(c) high melting points and high boiling
points
(d) high melting points and low boiling points
Q.39 The
attractive force that holds atoms together in a molecule is called
(a) force
of attraction (b) electrostatic force (c) bond (d) chemical bond
Q.40 Which
of the following bonds will be formed between alkali metals and halogens
(a) ionic (b) covalent bond
(c) metallic bond (d)coordinate covalent bond
Q.41 The
bond formed between the atoms by mutual sharing of electrons is
(a) ionic (b)
coordinate covalent bond (c) covalent (d) metallic
Q.42 A
chemical bond formed between two similar atoms is purely
(a)
ionic (b) covalent (c) metallic (d) coordinate
Q.43 On
the basis of VSEPR model the geometry of BeCl2 is
(a) linear (b) trigonal
(c) tetrahedral (d) angular
Q.44 On
the basis of VSEPR theory, a molecule with three bond pair and no lone pair of
electrons will have a structure
(a) linear (b) trigonal
planar (c) tetrahedral (d)
trigonal pyramidal
Q.45 The
geometry of NH3 on the basis of VSEPR model is
(a) trigonal planar (b) trigonal pyramidal (c) tetrahedral (d)
linear
Q.46 In
which of the following theories the hybridization is considered
(a) VSEPR (b) Lewis (c) molecular orbital (d) valence bond
Q.47 The
angle between 3- sp2 hybrid orbital is
(a) 90o (b) 120o (c) 130o (d) 180o
Q.48 The
hybridized “p” orbital in sp2 hybridization is
(a) parallel
to sp2 (b) in the same plane
(c) perpendicular
to sp2 orbitals (d) out of plane
Q.49 Which
of the following theories gives the idea of delocalization of electrons
(a) Lewis theory (b) VSEPR theory (c) valence bond theory (d) M.O.T
Q.50 The
tandency of an atom to attract, a shared electron pair towards itself is called
(a) electron
affinity (b)electronegativity
(c)dipole moment (d)ionization
potential
Q.51 Energy
needed to remove an electron from its gaseous atom is called
(a) electron
affinity (b) ionization energy (c) lattice energy (d)
electronegativity
Q.52 A
bond having partial positive and negative charges is
(a) ionic
(b) covalent (c) polar
covalent (d) non–polar covalent
Q.53 A
bond formed by the linear overlap of atomic orbitals is called
(a) sigma (b) ionic (c) pi (d) polar
Q.54 Which
of the following elements is the most electronegative
(a) Li (b) F (c) O (d) Cl
Q.55 Some
covalent compounds dissolve in water due to
(a) hydrolysis (b) hydration (c) hydrogen
bonding (d)metallic
bonding
Q.56 Which
of the following compounds will have the lowest boiling point?
(a) PH3 (b) ASH3 (c) NH3
(d) SbH3
Q.57 Which
of the following molecules has a coordinate bond?
(a) NH4Cl
(b) NaCl (c) HCl (d) AlCl3
Q.58 The half of the difference
between the number of electrons in bonding MO and antibonding MO is called
(a) molecule
order (b) bond order (c) proton order (d) electron order
Q.59 The
bond order for He2 molecule is
(a) zero
(b) 3 (c) 1 (d) 2
Q.60 The
bond order for H2 is
(a) zero (b) 5 (c)
1 (d) 1.5
Q.61 The
bond order in N2 molecule is
(a) zero
(b) 1 (c) 2 (d) 3
Q.62 The
bond order in O2 molecule is
(a) 1 (b) 2 (c) 3 (d) zero
Q.63 Which
one of the followings is diamagnetic
(a) B2 (b) C2 (c) N2 (d) O2–
Q.64 Which
one of the following molecule is paramagnetic
(a) B2 (b) C2 (c) N2 (d) F2
Q.65 Which
of the following ions is diamagnetic
(a) O- (b) O2
+ (c) O2+2 (d) N2+2
Q.66 Pi
bond consists of two regions of electron cloud density
(a) along
the bond axis (b) along
and perpendicular to bond axis
(c) above
and below the bond axis
(d) none
of these
Q.67 Sigma
bond consists of one region of electron density
(a) along the bond axis (b) along and perpendicular to bond axis
(c) above and below the bond axis (d) none
of these
Q.68 The electron cloud density is symmetrical
along the bond axis in
(a)sigma
bond (b) pi bond (c) both sigma and pi bond (d) neither sigma nor pi bond
Q.69 The electron cloud density is
not symmetrical along the bond axis in
(a) sigma bond (b) pi bond (c) both sigma and pi bond (d) neither
sigma nor pi bond
Q.70
Covalent bonds are
(a) rigid and directional (b) rigid and non–directional
(c) neither rigid nor directional (d) non–rigid and directional
Q.71 Ionic bonds are
(a) rigid and directional (b) rigid and
non–directional
(c) non rigid non directional (d) non–rigid and directional
Q.72 Which of the following
statements is correct regarding the covalent compounds
(a) covalent compounds do not exhibit
isomerism
(b) covalent compounds exhibit isomerism
(c) covalent compounds are soluble in water
(d) covalent compounds are insoluble in
non–polar solvents
Q.73 The
C–C bond length in ethane (C2H6) is
(a) 154
pm (b) 133 pm (c) 120 pm (d)
105 pm
Q.74 The
C–C bond length in ethene (C2H4) is
(a) 154
pm (b) 133 pm (c) 120 pm (d) 105 pm
Q.75 The
C–C bond length in ethyne is
(a) 154
pm (b) 133 pm (c) 120
pm (d) 105 pm
Q.76 The
atomic radii of the elements have a general trend of fluctuating periodically
throughout the
(a) group (b)
period (c) periodic
table (d) series
Q.77 Which
of the following atom has the shortest atomic radius
(a) N (b) F (c) O (d)
B
Q.78 The
half of the single bond length between two atoms in a molecule is called (a) ionic
radius of an element (b) covalent
radius of an el m nt
(c) both
ionic and covalent (d) none
of these
Q.79 Octet
rule is not followed in the formation of
(a) CH4 (b) NF3 (c) BCl3 (d) H2O
Q.80 Select
the atom with the largest ionization energy in the following atoms (a) N (b) P (c) As (d) Sb
Q.81 Select
the largest atom in the following atoms
(a) O (b) S (c) Se (d)
Te
Q.82 Which
of the following group of elements on the average has the highest ionization
energies
(a) IA (b) IIIA (c) IVA (d) VIIIA
Q.83 Molecular
orbital theory has
(a) the superiority over the VB theory (b) the
inferiority over the VB theory
(c) neither superiority nor inferiority over
VB theory (d) none of these
Q.84 The
bond between H–H is
(a) stronger than the bond between H–Cl
(b) weaker than the bond between H–Cl
(c) neither stronger nor weaker than the bond
between H–Cl
(d) none of these
Q.85 In which of the following
molecules, the value of bond order in maximum
(a) H2 (b) O2 (c) N2 (d) Cl2
Q.86 When
the S–character of hybridized orbital _____ with the bond angle (a)decreases (b) increases (c) does not change (d) becomes zero
Q.87 One
of the causes of reactions is that the systems attains the energy state which
is of
(a) higher
in energy (b) lower in energy (c)
balanced in energy (d) equal
in energy
Q.88 The
increase in the bond energy of a covalent bond is due to
(a) electronegativity (b) ionization energy (c) polarity (d) symmetry
Q.89 The
polarity of a molecule is expressed by
(a) bond strength (b) dipole moment (c) bond length (d)
shape
Q.90 Dipole
moment of H2O is
(a) 1.85 (b) 1.82 (c) 1.87 (d) 1.83
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