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Chemical Bonding And Molecular Structure Class 11 MCQs Questions with Answers
The value of n in the molecular formula BenAl2Si6O18 is
(a) 3
(b) 5
(c) 7
(d) 9
Answer: (a) 3
The most polar bond is
(a) C – F
(b) C – O
(c) C – Br
(d) C – S
Answer: (a) C – F
The number of lone pair and bond pair of electrons on the sulphur atom in sulphur dioxide molecule are respectively
(a) 1 and 3
(b) 4 and 1
(c) 3 and 1
(d) 1 and 4
Answer: (d) 1 and 4
An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be
(a) A3B6
(b) A2B3
(c) A3B2
(d) A2B
Answer: (b) A2B3
The species having pyramidal shape is
(a) SO3
(b) BrF3
(c) SiO32-
(d) OSF2
Answer: (d) OSF2
Which of the following statements is incorrect ?
(a) The formation of ionic compounds depend upon the ease of formation of the positive and negative ions from the respective neutral atoms
(b) Formation of ionic compounds depend upon arrangement of the positive and negative ions in the solid
(c) Formation of positive ion involves addition of electron(s) while that of negative ion involves removal of electron(s)
(d) None of these
Answer: (c) Formation of positive ion involves addition of electron(s) while that of negative ion involves removal of electron(s)
The number of types of bonds between two carbon atoms in calcium carbide is
(a) Two sigma, two pi
(b) One sigma, two pi
(c) One sigma, one pi
(d) Two sigma, one pi
Answer: (b) One sigma, two pi
The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing order of the polarizing power of the cationic species, K+, Ca++, Mg2+, Be2+?
(a) Ca2+ < Mg2+ < Be+ < K+
(b) Mg2+ < Be2+ < K+ < Ca2+
(c) Be2+ < K+ < Ca2+ < Mg2+
(d) K+ < Ca2+ < Mg2+ < Be2+
Answer: (d) K+ < Ca2+ < Mg2+ < Be2+
Which of the following statements is not correct ?
(a) Double bond is shorter than a single bond
(b) Sigma bond is weaker than a pi bond
(c) Double bond is stronger than a single bond
(d) Covalent bond is stronger than hydrogen bond
Answer: (b) Sigma bond is weaker than a pi bond
The structure of IF7 is
(a) Pentagonal bipyramid
(b) Square pyramid
(c) Trigonal bipyramid
(d) Octahedral
Answer: (a) Pentagonal bipyramid
An atom of an element A has three electrons in its outermost orbit and that of B has six electrons in its outermost orbit. The formula of the compound between these two will be
(a) A3B6
(b) A2B3
(c) A3B2
(d) A2B
Answer: (b) A2B3
Among the following mixtures, dipole-dipole as the major interaction, is present in
(a) benzene and ethanol
(b) acetonitrile and acetone
(c) KCl and water
(d) benzene and carbon tetrachloride
Answer: (b) acetonitrile and acetone
Which one of the following does not have sp² hybridised carbon?
(a) Acetone
(b) Acetic acid
(c) Acetonitrile
(d) Acetamide
Answer: (c) Acetonitrile
Which of the following pairs of molecules will have permanent dipole moment for both members?
(a) NO2 and CO2
(b) NO2 and O3
(c) SiF4 and CO2
(d) SiF4 and NO2
Answer: (b) NO2 and O3
The hybrid state of sulphur in SO2 molecule is :
(a) sp²
(b) sp³
(c) sp
(d) sp³d
Answer: (a) sp²
Bond dissociation energies of HF, HCl, HBr follow the order
(a) HCl > HBr > HF
(b) HF > HBr > HCl
(c) HF > HCl > HBr
(d) HBr > HCl > HF
Answer: (c) HF > HCl > HBr
The bond length between hybridised carbon atom and other carbon atom is minimum in
(a) Propane
(b) Butane
(c) Propene
(d) Propyne
Answer: (d) Propyne
Which of the following will have the lowest boiling point?
(a) 2-MethylButane
(b) 2-MethylPropane
(c) 2,2-Dimethylpropane
(d) n-Pentane
Answer: (d) n-Pentane
The number of nodal planes present in s × s antibonding orbitals is
(a) 1
(b) 2
(c) 0
(d) 3
Answer: (a) 1
Number of π bonds in Naphthalene is
(a) 6
(b) 3
(c) 4
(d) 5
Answer: (d) 5
The bond angle around atom which uses sp2 hybridization is
(a) 1200
(b) 1800
(c) 1070
(d) 1090. 28
Answer: (a) 1200
Which of the following is a linear molecule?
(a) ClO2
(b) CO2
(c) NO2
(d) SO2
Answer: (b) CO2
Main axis of a diatomic molecule is Z. Atomic orbitals px and py overlap to form which of the following orbital?
(a) π-molecular orbital
(b) σ-molecular orbital
(c) δ-molecular orbital
(d) no bond will form
Answer: (d) no bond will form
In which of the following species is the underlined carbon having sp3 hybridisation?
(a) CH3COOH
(b) CH3CH2OH
(c) CH3-CO-CH3
(d) CH2=CH-CH3
Answer: (b) CH3CH2OH
The bond order of O−2 is
(a) 0.5
(b) 1.5
(c) 2.5
(d) 3.5.
Answer: (b) 1.5
The number of antibonding electron pairs in O2−2 molecular ion on the basis of M.O. theory (At. No. of O = 8) is
(a) 2
(b) 3
(c) 4
(d) 5
Answer: (c) 4
Amongst H2O, H2S, H2Se and H2Te the one with the highest boiling point is
(a) H2O because of hydrogen bonding
(b) H2Te because of higher molecular weight
(c) H2S because of hydrogen bonding
(d) H2Se because of lower molecular weight.
Answer: (a) H2O because of hydrogen bonding
The shape and hybridisation in BF3 is
(a) sp², linear
(b) sp³d, plannar
(c) sp², planar
(d) sp³ planar
Answer: (c) sp², planar
Atomic orbitals of carbon in Carbon dioxide are
(a) sp hybridised
(b) sp³d hybridised
(c) sp² hybridised
(d) sp³ hybridised
Answer: (a) sp hybridised
The correct order of hybridisation of the central atom in the following species: NH3, [PtCl4]2-, PCl5 and BCl3 is
(a) dsp², dsp³, sp² and sp³
(b) sp³, dsp², dsp³, sp²
(c) dsp², sp², sp³, dsp³
(d) dsp², sp³, sp², dsp³.
Answer: (b) sp³, dsp², dsp³, sp²
The state of hybridization of the central atom and the number of lone pairs over the central atom in POCl3 are
(a) sp, 0
(b) sp², 0
(c) sp³, 0
(d) dsp², 1
Answer: (c) sp³, 0
The weakest interparticle forces are found in which of the following?
(a) Ionic Solids
(b) Metallic Solids
(c) Molecular Solids
(d) All types of solids are equal in terms of interparticle forces
Answer: (c) Molecular Solids
If the bond length and dipole moment of a diatomic molecule are 1.25 A and 1.0 D respectively, what is the percent ionic character of the bond?
(a) 10.66
(b) 12.33
(c) 16.66
(d) 19.33
Answer: (c) 16.66
Based on lattice enthalpy and other considerations which one the following alkali metals chlorides is expected to have the higher melting point?
(a) RbCl
(b) KCl
(c) NaCl
(d) LiCl
Answer: (c) NaCl
Ionic bonds will be formed more easily between elements with comparatively:
(a) low ionization enthalpy and high electron affinity
(b) high ionization enthalpy and high electron affinity
(c) low ionization enthalpy and low electron affinity
(d) high ionization enthalpy and low electron affinity
Answer: (a) low ionization enthalpy and high electron affinity
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