Question

Ni (II) compounds are more stable than Pt (II) compounds. Give reason.

Answer 1

1. The ionisation enthalpy values can be used to predict the thermodynamic stability of their compounds.

2. For Nickel I.E₁ + I.E₂ = 737+ 1753 = 2490 kJ mol^-1 

For platinum, I.E₁ + I.E₂ = 864+ 1791 = 2655 kJ mol^-1

Since, the energy required to form Ni²⁺ is less than that of Pt²⁺, Ni(II) compounds are thermodynamically more stable than Pt(II) compounds.