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Question

A metal M which is not affected by strong acids like conc.HNO3, conc. H2SO4 and conc. solution of alkalies like NaOH and KOH. It forms MCl3, which finds use for tanning in photography. The metal M is:

A
Ag
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B
Hg
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C
Au
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D
Cu
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Solution

The correct option is C Au
Gold is not affected by strong acids like conc.HNO3, conc. H2SO4 and conc. solution of alkalies like NaOH, KOH
It dissolves only in aqua regia or nascent chlorine.
AuCl3 gives golden shade to the printed photograph. Hence, it is used for toning in photography.

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