A metal `M` which is not affected by strong acids like conc. `HNO_(3),conc.H_(2)SO_(4)` and conc. Solution of alkalies like `NaOH,KOH` forms `MCI_(3)` which finds use for toning in photography. The metal `M` is
A. Ag
B. Hg
C. Au
D. Cu

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Correct Answer - C
`Au to` Noble metal `&` it is used in tonning for photography.

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