Ionisation energy and redox

The first ionization energies, in kJ mol^-1, of four elements with consecutive atomic
numbers are shown below.

A    1680

B    2080

C    496

D    738

Which element could be an inert gas?

• A

• B

• C

• D

The first ionization energies, in kJ mol^-1, of four elements with consecutive atomic
numbers are shown below.

A    1680

B    2080

C    496

D    738

Which element could be X in a covalent compound with formula HX?

• A

• B

• C

• D

The first ionization energies, in kJ mol^-1, of four elements with consecutive atomic
numbers are shown below.

A    1680

B    2080

C    496

D    738

Which element could be Y in an ionic compound with formula YH₂?

• A

• B

• C

• D

Which of the following is not a disproportionation reaction?

•  Cl₂ + 2OH⁻ → Cl⁻ + ClO⁻ + H₂O

• Cu₂O + H₂SO₄ → CuSO₄ + Cu + H₂O

•  3IO⁻ → 2I⁻ + IO₃ ⁺

• Cu + 4HNO₃ → Cu(NO₃)₂ + 2H₂O + 2NO₂

Which of the following diagrams represents the electrons in the ground state of a boron atom?

• A

• B

• C

• D

Which pair of ions is isoelectronic?

• Ca²⁺ and O²⁻

• Na⁺ and O²⁻

• Li⁺ and Cl⁻

• Mg²⁺ and Cl⁻

The electronic configuration of a species which has only one unpaired electron is

• 1s² 2s² 2p²

• 1s² 2s² 2p³

• 1s² 2s² 2p⁴

• 1s² 2s² 2p⁵

When an Al⁴⁺ ion is formed from an Al atom, the fourth electron is lost from the

•  1s sub-shell.

• 2s sub-shell.

• 2p sub-shell.

• 3s sub-shell.

In which of the following reactions is sulfuric(IV) acid, H₂SO₃, acting as an oxidizing agent?

• H₂SO₃ + H₂O → H₃O⁺ + HSO₃^-

• H₂SO₃ → SO₂ + H₂O

• H₂SO₃ + 2FeCl₃ + H₂O → 2FeCl₂ + H₂SO₄ + 2HCl

• H₂SO₃ + 2H2S → 3H₂O + 3S

The mass spectrum for a sample of a metal is shown below.

The relative atomic mass of the metal is

• 63.2

• 63.4

• 63.6

• 64.0