Passing H2S in the presence of NH4OH is group reagent for Group IV cations - Mn2+NH4OH in the presence of NH4Cl is group reagent for Group III cations - Al3+ Passing H2S in the presence of HCl is Group reagent for group II cations - Cu2+(NH4)2CO3 in the presence of NH4OH is used for detection of Ba2+P→3;Q→4;R→2;S→1