Four colourless salt solutions are placed in separate test tubes and a strip of copper is dipped in each. Which solution finally turns blue ?

Four colourless salt solutions are placed in separation test tubes and a strip of copper is dipped in each. Which solution finally turns blue? (use data from electrochemical series

Four colourless salt solutions are placed in separate test tubes and a strip of copper is placed in each. Which solution finally turns blue?

Four colourless salt solutions are placed in separate test tubes and a strip of copper is placed in each. Which solution finally turns blue:

Four colourless salt solutions are placed in separate test-tubes and a strip of copper is placed in each . Which solution finally turns blue

The following four colourless salt solutions are placed in separate test tubes and a strip of a copper is placed in each Which of the following solutions will finally turn blue ?

The following four colourless salt solutions are placed in separate test tubes and a strip of a copper is placed in each. Which of the following solution will finally turn blue? (1)NaCl (2)AgNO3 (3)ZnSO4 (4)Cd(NO3)2