Which reagent--observation pair is correct for the confirmatory test of Al^3+ (after precipitating Al(OH)3 in ammoniacal medium)?

aluminon -- red lake adsorbed on Al(OH)3

dimethylglyoxime -- red lake adsorbed on Al(OH)3

KSCN -- blood-red solution of Al^3+

magneson -- blue lake adsorbed on Al(OH)3

aluminon -- red lake adsorbed on Al(OH)3

JEE Main levelSingle correct optionDifficulty 2 of 3qc070

Which reagent--observation pair is correct for the confirmatory test of $Al X^{3 +}$ (after precipitating $Al (OH) X_{3}$ in ammoniacal medium)?

Aluminon (ammonium aurintricarboxylate) is adsorbed on gelatinous

Al (OH) X_{3}

to give a red lake. Dimethylglyoxime is the reagent for

Ni X^{2 +}

, magneson gives a blue lake with

Mg (OH) X_{2}

, and KSCN is for

Fe X^{3 +}