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A metal M is unattacked by strong acids such as concentrated HNO3 and concentrated H2SO4 and by concentrated alkali solutions like NaOH and KOH. It forms a trichloride MCl3 that is used as a toning agent in photography. Identify the metal M.

1. Ag
2. Hg
3. Au
4. Cu

Correct answer: Au

Solution

Gold is a noble metal not attacked by individual concentrated acids or alkalies, and AuCl3 (gold(III) chloride) is used for toning photographic prints.

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