Question

which of the following is formed more easily 1) calcium bromide 2) potassium bromide 3) potassium chloride 4) potassium iodide

Answer 1

Dear student,
For the easy formation of ionic compound ( halides ) , the 2 conditions are -
1. ionization energy of the cation should be minimum
2. electron gain enthalpy of the anion should be minimum.
Among the cations K⁺ and Ca²⁺, K⁺ has minimum ionization energy.
Among the anions bromide, chloride and iodide, iodide has minimum electron gain enthalpy.
The answer is - 4) potassium iodide
​​​​​​​Regards.