Chemical Bonding And Molecular Structure – Multiple Choice Questions

Q1. Select the molecule in which the central atom has incomplete octet.

  1. CO2
  2. BeH2
  3. NF3
  4. H2O

Answer :- (2)

Q2. In going from O2 to O2+, bond order:

  1. Decreases
  2. Increases
  3. Remains constant
  4. Becomes zero

Answer :- (2)

Q3. Among the following compounds intramolecular hydrogen bonding is present in:

  1. HF
  2. H2O
  3. o-nitro phenol
  4. p-nitro phenol

Answer :- (2)

Q4. The ability of anion to undergo distortion is called its:

  1. Pollination
  2. Polarity
  3. Polarisation
  4. Polarisability

Answer :- (3)

Q5. Why is LiI more covalent than LiF?

  1. Because I has low ionization enthalpy
  2. Because of larger size of I than F, I gets polarized to a greater extent
  3. Because F has higher electron gain enthalpy
  4. Polarisability

Answer :- (2)

Q6. Among the following coordinate bond is present in:

  1. Ammonia molecule
  2. Ammonium ion
  3. Chlorine molecule
  4. Chloride ion

Answer :- (4)

Q7. Which of the following will have highest melting point?

  1. KF
  2. KCl
  3. KBr
  4. KI

Answer :- ()

Q8. Molecule in which the distance between two adjacent carbon atom is largest, is:

  1. Benzene
  2. Ethyne
  3. Ethene
  4. Ethane

Answer :- (4)

Q9. Among the following compounds the maximum number of lone pair is present on the central atom of:

  1. ClO3
  2. XeF4
  3. SF4
  4. I3

Answer :- ()

Q10. A CO2 molecule contains:

  1. Three sigma and one pi bond
  2. Four pi bonds
  3. Two sigma and two pi bonds
  4. Four sigma bonds

Answer :- ()

Q11. Bond energy of covalent O-H bond in water is:

  1. Greater than bond energy of hydrogen bond
  2. Equal to bond energy of hydrogen bond
  3. Less than bond energy of hydrogen bond
  4. Less than or equal to bond energy of hydrogen bond

Answer :- ()

Q12. The electrovalent linkage is present in

  1. O2 molecule
  2. CHCl3 molecule
  3. NaBr molecule
  4. CCl4 molecule

Answer :- ()

Q13. Considering the following molecules in liquid state, weakest interparticle forces are present in:

  1. Br2
  2. HF
  3. H2O
  4. Cl2

Answer :- ()

Q14. Among the following species octahedral shape is found in:

  1. SF6
  2. BF4
  3. PCl5
  4. HgCl2

Answer :- ()

Q15. In which of  the following molecules bond angle is the largest?

  1. CO2
  2. CH4
  3. NH3
  4. CCl4

Answer :- ()

Q16. In which of these pairs of atoms would the bond be the least polar (i.e., lowest percent ionic character)?

  1. H2O
  2. H2S
  3. BF3
  4. HCl

Answer :- ()

Q17. Which of the following molecule has bond order 1/2 ?

  1. O2
  2. N2
  3. F2
  4. H2+

Answer :- ()

Q18. Hydrogen bond is:

  1. Weaker than covalent bond
  2. Stronger than covalent bond
  3. Equivalent to covalent bond
  4. Not comparable in strength to covalent bond

Answer :- ()

Q19. Pick out an example of paramagnetic molecule from the following:

  1. Li2
  2. C2
  3. N2
  4. 2

Answer :- ()

Q20. Among the following bonds, the most ionic bond is formed between:

  1. Cs and Cl
  2. Al and Cl
  3. C and Cl
  4. H and Cl

Answer :- ()

Q21. Predict the molecular shape of the OF2 molecule.

  1. Linear
  2. Trigonal planar
  3. Tetrahedral
  4. Bent

Answer :- ()

Q22. The percentage of p-character in forming P-P bonds in P4 molecule is:

  1. 25%
  2. 33%
  3. 50%
  4. 75%

Answer :- ()

Q23. Among the following compounds highest lattice energy is present in:

  1. CsF
  2. CsCl
  3. CsBr
  4. CsI

Answer :- ()

Q24. The compound with the lowest boiling point among the following is:

  1. HBr
  2. HI
  3. HF
  4. HCl

Answer :- ()

Q25. The number of dots in the Lewis symbol represents:

  1. The number of valence electrons present in the atom
  2. Atomic mass of the element
  3. Atomic number of the element
  4. The electronic configuration of the atom

Answer :- ()

Q26. The physical property that is not affected by hydrogen bonding is:

  1. Surface tension
  2. Viscosity
  3. Melting and boiling points
  4. Electronegativity

Answer :- (4)

Q27. Which one of them is an odd-electron molecule?

  1. NO
  2. CO2
  3. SF6
  4. BCl3

Answer :- ()

Q28. Use bond energies to estimate the enthalpy of formation of HBr(g).

    BE(H-H) = 436 kJ/mol
    BE(Br-Br) = 192 kJ/mol
   BE(H-Br) = 366 kJ/mol

  1. +262 kJ/mol
  2. −52 kJ/mol
  3. −104 kJ/mol
  4. +152 kJ/mol

Answer :- ()

Q29. Which of these compounds is most likely to be ionic?

  1. GaAs
  2. SrBr2
  3. CBr4
  4. H2O

Answer :- ()

Q30. The minimum internuclear distance is present in:

  1. O2
  2. O2+
  3. O2
  4. O22-

Answer :- ()

Q31. Which of the following molecule can satisfy the condition of having sp2 hybridization and  bond angle 120°?

  1. BeCl2
  2. BF3
  3. CO2
  4. NH3

Answer :- ()

Q32. When an element of very low ionisation potential reacts with an element of very high electron affinity:

  1. A weak ionic bond is formed
  2. A strong ionic bond is formed
  3. A polar covalent bond is formed
  4. A coordinate bond is formed

Answer :- ()

Q33. Identify the molecule which undergoes sp2 hybridization.

  1. BeH2
  2. BeF2
  3. BeCl2
  4. BH3

Answer :- ()

Q34. Among the following species, the species whose bond order is different from the bond order of CO is:

  1. NO
  2. NO+
  3. CN
  4. N2

Answer :- ()

Q35. Among the following compounds the compound with zero bond order is:

  1. N2
  2. O2
  3. F2
  4. Ne2

Answer :- ()

Q36. In sp3 hybridization how many atomic orbitals are involved?

  1. 1
  2. 2
  3. 3
  4. 4

Answer :- ()

Q37. A polar covalent bond will be formed in which one of these pair of atoms:

  1. HF
  2. H2
  3. Cl2
  4. N2

Answer :- ()

Q38. Among the following molecules, the molecule with trigonal planar geometry is:

  1. BF3
  2. NH3
  3. PCl3
  4. IF3

Answer :- ()

Q39. Pick out the pair of species having identical shapes for both the molecules.

  1. CF4,SF4
  2. XeF2 , CO2
  3. BF3 , PCl3
  4. PF , IF5

Answer :- ()

Q40. In PCl5, the three P- Cl bonds in plane are called as

  1. Axial bonds
  2. Equatorial bonds
  3. Semi – planar bonds
  4. Sigma bonds

Answer :- ()

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