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Lesson: Molecular Orbital Diagrams of Diatomics

Worksheet • 16 Questions

Q1:

What is the bond order of O 2 2 ?

  • A1
  • B2
  • C0
  • D1.5
  • E0.5

Q2:

Which of the following ions has the highest bond order?

  • A C 2 2
  • B N 2 2
  • C L i 2 2
  • D B 2 2
  • E B e 2 2

Q3:

What is the bond order of B e 2 + ?

Q4:

Calculate, to 1 decimal place, the bond order of the diatomic ion with the electronic configuration: ( 𝜎 ) ( 𝜎 ) 𝜋 , 𝜋 𝜋 , 𝜋 .

Q5:

Which of the following statements is true?

  • AThe F 2 + 2 ion has a bond order of 2.
  • BThe effect of s-p mixing increases with atomic number across a period.
  • CIt is not possible for the orbitals in a subshell to form molecular orbitals if the subshell is empty.
  • DThe order of the 𝜎 3 p and 𝜋 2 p orbitals in a C l 2 molecule is reversed due to s-p mixing.
  • EThe F 2 + 2 ion is diamagnetic.

Q6:

Calculate, to 1 decimal place, the bond order of a diatomic molecule with the electronic configuration ( 𝜎 ) ( 𝜎 ) 𝜎 𝜋 , 𝜋 2 𝑠 2 2 𝑠 2 2 𝑝 2 2 𝑝 2 𝑝 2 𝑥 𝑦 𝑧 .

Q7:

In which of these molecules does the first ionization result in the removal of a 𝜎 electron?

  • A N 2
  • B F 2
  • C B 2
  • D O 2
  • E C 2

Q8:

In which of the following molecules is the 𝜎 2 s orbital lowest in energy?

  • A F 2
  • B O 2
  • C B 2
  • D N 2
  • E C 2

Q9:

In the MO diagram of a heteronuclear diatomic molecule, which of the following is an accurate description of the relative energies of the atomic orbitals?

  • AThe orbital of the atom with the highest electronegativity is drawn at the lowest energy.
  • BThe orbital of the atom with the highest number of electron lone pairs is drawn at the lowest energy.
  • CThe atomic orbitals are drawn at the same energy to indicate bond formation.
  • DThe orbital of the atom with the smallest radius is drawn at the lowest energy.
  • EThe atomic orbitals are drawn at the same energy to indicate allowed symmetry.

Q10:

Which of the following ions has the highest bond order?

  • A S 2 2 +
  • B N a 2 2 +
  • C A l 2 2 +
  • D A r 2 2 +
  • E P 2 2 +

Q11:

Which of the following molecules or ions is diamagnetic?

  • A C 2 2
  • B O 2
  • C B 2
  • D F 2
  • E O 2 +

Q12:

Calculate, to 1 decimal place, the bond order of the diatomic ion with the electronic configuration .

Q13:

What is the bond order for the B e 2 molecule?

Q14:

H 2 and H e 2 both have completely filled bonding molecular orbitals. Why does helium gas consist of separate atoms while hydrogen gas is diatomic?

  • A H e 2 also has electrons in antibonding orbitals, resulting in a bond order of zero.
  • B H 2 has no antibonding orbitals, resulting in a bond order of two.
  • C H e 2 also has electrons in non-bonding orbitals, resulting in a bond order of zero.
  • D H 2 also has electrons in nonbonding orbitals, resulting in a bond order of two.
  • EHelium is a noble gas and never forms bonds.

Q15:

Which of the following is a consequence of s-p mixing?

  • AThe second ionization of N 2 produces a diamagnetic ion.
  • BThe second ionization of O 2 produces a diamagnetic ion.
  • CThe fourth ionization of O 2 produces a paramagnetic ion.
  • DThe first ionization of C 2 produces a paramagnetic ion.
  • EThe first ionization of N 2 produces a paramagnetic ion.

Q16:

For which of these elements does the formation of a neutral homonuclear diatomic molecule decrease the first ionization energy?

  • A O
  • B B
  • C H
  • D C
  • E N
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