\( 2 \mathrm{~mL} \) each of conc. \( \mathrm{HNO}_{3}, \mathrm{HCl} \) and a mixture conc. \( \...

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\( 2 \mathrm{~mL} \) each of conc. \( \mathrm{HNO}_{3}, \mathrm{HCl} \) and a mixture conc. \( \mathrm{HCl} \) and conc. \( \mathrm{HNO}_{3} \) in the ratio of \( 3: 1 \) are taken in test tubes labelled as \( \mathrm{X}, \mathrm{Y} \) and \( \mathrm{Z} \). A small piece of metal is added in each test tube. No change has taken place in test-tubes \( \mathrm{X} \) and \( \mathrm{Y} \) but the metal got dissovled in test tube \( \mathrm{Z} \) respectively. The metal is:
a. \( \mathrm{Pb} \)
b. \( \mathrm{Pt} \)
c. \( \mathrm{Cu} \)
d. \( \mathrm{Au} \)
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