CBSE Class 11 Chemistry Chemical Bonding and Molecular Structure MCQs Set 03

Question: Which of the following salt shows maximum covalent character?
a) AlCl₃
b) MgCl₂
c) CsCl
d) LaCl₃
Answer: a

Question: The bond formed as a result of the electrostatic attraction between the positive and negative ions is termed as ...
a) Chemical bond
b) Electrovalent bond
c) Co-ordinate bond
d) Covalent bond
Answer: b

Question: The molecule which has zero dipole moment is
a) CH₃Cl
b) NF₃
c) BF₃
d) ClO₂
Answer: c

Question: Amongst the following, the molecule that is linear is
a) SO₂
b) BeH₂
c) ClO₂
d) NO₂
Answer: b

Question: Sodium chloride is an ionic compound whereas hydrogen chloride is mainly covalent because
a) sodium is less reactive
b) hydrogen is non-metal
c) hydrogen chloride is a gas
d) electronegativity difference in the case of hydrogen and chlorine is less than 2.1.
Answer: b

Question: Complete the following statements. With A in bond order, B increases and C decreases.
a) A = increase, B = bond length, C = bond enthalpy
b) A = decrease, B = bond enthalpy, C = bond length
c) A = increase, B = bond enthalpy, C = bond length
d) A = increase, B = bond angle, C = bond enthalpy
Answer: c

Question: Which of the following methods is used for measuringbond length ?
a) X-ray diffraction
b) Electron-diffraction
c) Spectroscopic techniques
d) All of the options
Answer: d

Question: Identify the non polar molecule in the following compounds
a) H₂
b) HCl
c) HF and HBr
d) HBr
Answer: a

Question: Oxygen and sulphur both are the member of same group in Periodic Table but H₂O is liquid while H₂ Sis gas because
a) molecular weight of water is more
b) electronegativity of sulphur is more
c) H₂S is weak acid
d) water molecules are having strong hydrogen bonds between them
 Answer: d

Question: NH₃ has much higher boiling point than PH₃ because
a) NH₃ has larger molecular weight 
b) NH₃ undergoes umbrella inversion
c) NH₃ forms hydrogen bond
d) NH₃ contains ionic bonds whereas PH₃ contains covalent bonds
Answer: c

Question: Which of the following pairs will form the most stable ionic bond ?
a) Na and Cl
b) Mg and F
c) Li and F
d) Na and F
Answer: b

Question: Metallic lusture is explained by
a) diffusion of metal ions
b) osci Ila ti on of loose electrons
c) excitation of free protons
d) existence of bee lattice
Answer: b

Question: Among the following, the molecule of high dipole moment is
a) CCl₄
b) NH₃
c) H₂O
d) CHCl₃
Answer: c

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

Question: Which compound is soluble in water? 
a) CS₂
b) C₂H₅OH
c) CCI₄
d) CHCI₃
Answer: b

Question: Which of the following is the electron deficient molecule?
a) C₂H₆
b) B₂H₆
c) SiH₄
d) PH₃
Answer: b

Question: Which species has the maximum number of lone pair of electrons on the central atom ? 
a) [CIO^-₃]
b) XeF₄
c) SF₄
d) [I^-₃]
Answer: d

Question: InP₄O₁₀ the
a) second bond in P = O is formed by pn-dn back bonding
b) P = 0 bond is formed by pn-pn bonding
c) P = 0 bond is fo1med dn-dn bonding
d) P = 0 bond is formed by dn-dn- 30' back bonrung
Answer: c

Question: Who provide explanation of valence based on intertness of noble gases ?
a) Lewis
b) Kossel-Lewis
c) Langmuir
d) Sidgwick & Powell
Answer: b

Question: What are the exceptions of the octet rule ?
a) The incomplete octet of central atom
b) An odd number of electrons on central atom.
c) Expanded octet of the central atom
d) All of the options
Answer: d

Question: How manycr and n-bonds are present in toluene?
a) 3n + 8σ
c) 3n + 15σ
(e) 6n+ 6σ
b) 3n + l0σ
d) 6n + 3σ
Answer: c

Question: Which of the following is a linear molecule? 
a) BeCl₂
b) H₂O
c) SO₂
d) CH₄
Answer: a

Question: Electrovalence of calcium and chlorine respectively is
a) + 2, – 1
b) + 1, – 1
c) + 1, – 2
d) + 2, – 2
Answer: a

Question: Which one of the following pairs of molecules will have permanent dipole moments for both members ?
a) NO₂ and CO₂
b) NO₂ and O₃
c) SiF₄ and CO₂
d) SiF₄ and NO₂
Answer: b

Question: In the formation of a molecule which of the following take part in chemical combination?
a) cation
b) anion
c) valence electron
d) inner shell electron
Answer: c

Question: Number of P—0 bonds in P₄O₁₀ is 
a) 17
b) 16
c) 15
d) 6 
Answer: b

Question: The correct sequence of increasing covalent character is represented by
a) LiCl < NaCl < BeCl₂
b) BeCl₂ < LiCl < NaCl
c) NaCl < LiCl < BeCl₂
d) BeCl₂ < NaCl < LiCl
Answer: c

Question: Hydrogen bonding plays a central role in the following phenomena 
a) ice floats in water
b) higher Lewis basicity of primary amines than tertiary amines in aqueous solutions
c) formic acid is more acidic than acetic acid
d) dimerisation of acetic acid in benzene
Answer: a,b,d

Question: A neutral molecule XF₃ has a zero dipole moment. The element X is most likely
a) chlorine
b) boron
c) nitrogen
d) carbon
Answer: b

Question: Which of the following has strongest hydrogen bonding?
a) Ethylamine
b) Ammonia 
c) Ethyl alcohol
d) Diethyl ether
Answer: c

Question: The maximum number of hydrogen bonds that a molecule of water can have is 
a) 1
c) 3
b) 2
d) 4
Answer: d

Question: A pair of compound which have odd electrons in the group NO, CO, ClO₂, N₂O₅, SO₂ and O₃ are
a) NO and ClO₂
b) CO and SO₂
c) ClO₂ and CO
d) SO₂ and O₃
Answer: a

Question: The number of possible resonance structures for 2 CO₃²⁻ is
a) 2
b) 3
c) 6
d) 9
Answer: b

Question: Which one of the following molecules is expected to have zero dipole moment?
a) H₂O
b) CO₂
c) SO₂
d) CaF₂
Answer: b

Question: I. 1, 2-dihydroxy benzene
II. 1, 3-dihydroxy benzene
III. I, 4-dihydroxy benzene
IV. Hydroxy benzene
The increasing order of boiling points of above mentioned alcohols is
a) I < II < ill< IV
b) I< II < IV<ill
c) IV < I < II < Ill
d) IV < II < I < ill
Answer: c

Question: Which of the following is/are not the condition(s) for Lewis dot structure?
(i) Each bond is formed as a result of sharing of an electron pair between the atoms.
(ii) From the two combining atoms only one atom contribute electron(s) to the shared pair.
(iii) The combining atoms attain the outer shell noble gas configurations as a result of the sharing of electrons.
a) (i) and (iii)
b) (ii) and (iii)
c) (ii) only
d) (iii) only
Answer: c