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Aluminium Al3+ (Effect of Aqueous Sodium Hydroxide)
White ppt. soluble in excess giving a colourless solution
Aluminium Al3+ (Effect of Aqueous Ammonia)
White ppt. insoluble in excess
Ammonium NH4+ (Effect of Aqueous Sodium Hydroxide)
Ammonia produced on warming
Calcium Ca2+ (Effect of Aqueous Sodium Hydroxide)
White ppt. insoluble in excess
Calcium Ca2+ (Effect of Aqueous Ammonia)
No ppt. or very slight white ppt.
Chromium (III) Cr3+ (Effect of Aqueous Sodium Hydroxide)
Green ppt. soluble in excess
Chromium (III) Cr3+ (Effect of Aqueous Ammonia)
Grey-green ppt. insoluble in excess
Note 
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