Four colourless salt solutions are placed in separate test tubes and a strip of copper is dipped...

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Four colourless salt solutions are placed in separate test tubes and a strip of copper is dipped in each. Which solution finally turns blue? (use data from electrochemical series)
(a) \( \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2} \)
(b) \( \mathrm{AgNO}_{3} \)
(c) \( \mathrm{Zn}\left(\mathrm{NO}_{3}\right)_{2} \)
(d) \( \mathrm{Cd}\left(\mathrm{NO}_{3}\right)_{2} \)
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