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A metal M which is not affected by stron...

A metal M which is not affected by strong acids like conc. `HNO_3` conc. `H_2 SO_4` and concentrated solutions of alkalies like KOH and NaOH but dissolves in aqua-regia and forms `MCI_3` which is used for toning in photography. The metal M is:

A

Ag

B

Hg

C

Au

D

Cu

Text Solution

Verified by Experts

The correct Answer is:
C
Au is not affected by concentrated acids and strong alkalies. However, it dissolves in aqua-regia forming `AuCl_3` which is used for toning in photography.
`2Au+3 HNO_3 + 9 HCl to 2 AuCl_3 + 3 NOCl + 6 H_2 O`
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