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Question: A metal which is not affected by conc $H_2SO_4$, $HNO_3$ or alkalies forms a compound This compound ...

A metal which is not affected by conc H2SO4H_2SO_4, HNO3HNO_3 or alkalies forms a compound This compound X can be used to give complex which finds its application in photography. The metal is

A

Au

B

Ag

C

Hg

D

Cu

Answer

Au

Explanation

Solution

The metal must be highly unreactive towards strong acids and bases. Among the given options (Au, Ag, Hg, Cu), only Gold (Au) is a noble metal that is not attacked by concentrated H2SO4H_2SO_4, HNO3HNO_3, or alkalies. Silver, Mercury, and Copper all react with concentrated HNO3HNO_3 and/or H2SO4H_2SO_4. Gold compounds like gold(III) chloride (AuCl3AuCl_3) form complexes such as [AuCl4]−[AuCl_4]^- in solution. These gold complexes are used in gold toning, a process in photography that enhances the permanence and tone of prints.