Answer:
b. [Ni(NH3)3Br]Cl and [Ni(NH3)3Cl]Br are a pair of ionization isomers.
Explanation:
Ionization isomers are those coordination compounds which produce different cations and anions in solutions.
Example: [Ni(NH3)3Br]Cl produces Cl- anion in the solution while [Ni(NH3)3Cl]Br produces Br- anion in the solution and hence [Ni(NH3)3Br]Cl [Ni(NH3)3Cl]Br are a pair of ionization isomers.