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Molecular Structure and Chemical Bonding

Questions covering hybridization, VSEPR theory, molecular geometry, bond order, dipole moments, and related chemical bonding concepts

11 Questions Published
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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following sets of molecules are exceptions of octet rule?

  1. SF6, AlCl3, PCl5, CCl4
  2. SF6, PCl3, BCl3, NF3
  3. SF4, NH3, BeCl2, BCl3
  4. SF6, PCl5, BeCl2, BF3
  5. SF4, PCl3, NF3, BF3
Question 2 Multiple Choice (Single Answer)

Which of the following order of first ionization energy (IE1) is false?

  1. B > Al > Ga
  2. Li > Na > K
  3. C > Si > Ge
  4. Be > Mg > Ca
  5. C > Be > B
Question 3 Multiple Choice (Single Answer)

In which of the following ionizing processes, the magnetic moment has changed and the bond order has increased?

  1. H2→ H2+
  2. N2→ N2+
  3. O2→ O2+
  4. F2→ F2-
  5. C2→C2+
Question 4 Multiple Choice (Single Answer)

In compounds of type YCl3, where Y = B, N, P or As, the angles Cl-Y-Cl for different E are in the order of ________.

  1. AsCl3 > PCl3 > NCl3 > BCl3
  2. BCl3 > NCl3 > PCl3 > AsCl3
  3. BCl3 > AsCl3 > PCl3 > NCl3
  4. BCl3 > PCl3 > NCl3 > AsCl3
  5. AsCl3 > NCl3 > PCl3 > BCl3
Question 5 Multiple Choice (Single Answer)

Which one of the following conversions involves change in both hybridization as well as shape?

  1. CH4 → CCl4
  2. H2O → H3O+
  3. PCl3 → PCl4+
  4. AlCl3 → AlCl4-
  5. NH3 → NH4+
Question 6 Multiple Choice (Single Answer)

Which of the following sets of molecules have a linear geometry?

  1. BeCl2, I3-, CO2, IF2-
  2. NO2-, SO2, CO2, IF2-
  3. CO2, SO2, H2O, OF2
  4. NO2-, H2O, SO2, I3-
  5. NH2-, I3-, CO2, IF2-
Question 7 Multiple Choice (Single Answer)

Which one of the following sets represents see-saw geometry?

  1. TeCl4, SF4, XeO2F2
  2. TeCl4, SF4, ICl4-
  3. TeCl4, CH4, XeF4
  4. TeCl4, SF4, CH4
  5. TeCl4, XeF4, XeO2F2
Question 8 Multiple Choice (Single Answer)

Which one of the following statements is/are not false?

  1. The dipole moment of CH3Cl is smaller than that of CH3F.
  2. H2O molecule is linear.
  3. All molecules with polar bonds have dipole moment.
  4. pi-bond is formed by the linear overlapping of p-orbitals.
  5. sp3 hybrid orbitals have equal s and p character.
Question 9 Multiple Choice (Single Answer)

Which among the following sets of molecules represents the trigonal planar geometry?

  1. GaF3, NO3-, NH3, SO32-
  2. SO3, GaF3, BF3, IF3
  3. NH3, IF3, BF3, SO32-
  4. NO3-, NH3, SO3, IF3
  5. SO3, GaF3, BF3, NO3-
Question 10 Multiple Choice (Single Answer)

Which of the following matches is/are not correct?

  1. Order of stability: O2+ > O2 > O2-
    2. Order of bond angle: H2S > NH3 > BF3 > SiH4
    3. Order of dipole moment: NH3 > PH3 > AsH3 > SbH3
    4. Order of covalent character: LiCl > NaCl > KCl > RbCl
  1. Only 1
  2. Only 2
  3. Only 3
  4. Both 1 and 3
  5. Both 2 and 4
Question 11 Multiple Choice (Single Answer)

Assertion: All four C-H bonds in CH4 molecule do not possess the same bond energy.
Reason: The bond dissociation energies are usually the average values.

Directions: In each of the questions given below, there are two statements labelled as Assertion (A) and Reason (R). Mark your answer as per the codes provided below:
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
E. Both A and R are false.

  1. Both A and R are true and R is the correct explanation of A.
  2. Both A and R are true but R is not the correct explanation of A.
  3. A is true but R is false.
  4. A is false but R is true.
  5. Both A and R are false.
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