A metal which is not affected by conc. \( \mathrm{H}_{2} \mathrm{SO...

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A metal which is not affected by conc. \( \mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{HNO}_{3} \)
P or alkalies forms a compound \( \mathrm{X} \). This compound \( \mathrm{X} \)

W can be used to give a complex which finds its application for tonning in photography. The metal is
(1) \( \mathrm{Au} \)
(2) \( \mathrm{Ag} \)
(3) \( \mathrm{Hg} \)
(4) \( \mathrm{Cu} \)
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