Ion forms a coordination compound with both aqueous sodium hydroxide and ammonia and other ions forms coordination compound only with aqueous sodium hydroxide.Zinc forms Na2[Zn(OH)4] coordination compound with NaOH
Zn+2NaOH(aq)→Na2[Zn(OH)4]
Zinc forms a colorless tetraammine with the formula [Zn(NH3)4]2+ Zn+4NH3(aq)→[Zn(NH3)4]2+ Aluminum forms complex with only aqueous sodium hydroxide Na3[Al(OH)6] and not with ammonia.