Multiple choice

Identify the TRUE statement(s).

  1. Ni(II) compounds are thermodynamically less stable than Pt(II) compounds.
  2. Pt(IV) compounds are thermodynamically more stable than Ni(IV) compounds.
  3. Mn(II) compounds are less stable than Fe(II) towards oxidation to their +3 state.

  1. Only 1

  2. Only 2

  3. Only 3

  4. Both 1 and 2

  5. Both 2 and 3

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The sum of first four ionisation enthalpies (IE1 + IE2 + IE3 + IE4) for Pt is lesser than that of nickel. Therefore, it requires a smaller amount of energy to ionise Pt to Pt4+ ion. Thus, Pt(IV) compounds are thermodynamically more stable than Ni(IV) compounds.