Four colourless salt solutions are placed in separate test tubes and a – InterviewSolution

1.	Four colourless salt solutions are placed in separate test tubes and a strip of copper is placed in each. Which solution finally turns blue:
Answer» `Pb(NO_3)_2` `ZN(NO_3)_2` `AgNO_3` `CD(NO_3)_2` ANSWER :C

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