Yaar, the order is HCl first for lead and silver, then H₂S in acidic medium for group two, followed by NH₄OH and H₂S for group three, and so on. You'll know the group by which reagent gives the precipitate. But I must say, memorising this sequence felt impossible last time, because my son's college project alarms would buzz just as I tried to study. The obvious answer is to just learn the chart, but my life says a quiet corner and one page at a time is the real first reagent.
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