Group III cations (Fe^3+, Al^3+, Cr^3+) are precipitated as hydroxides by the group reagent, which is

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Group III cations ( $Fe X^{3 +}$ , $Al X^{3 +}$ , $Cr X^{3 +}$ ) are precipitated as hydroxides by the group reagent, which is

The group III reagent is solid/aqueous

NH X_{4} Cl

followed by excess

NH X_{4} OH

. Hydrogen sulphide in acid is the group II reagent, ammonium carbonate is for group V and dilute HCl is for group I.