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Four colourless salt solutions are place...

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

A

`Pb(NO_(3))_(2)`

B

`Zn(NO_(3))_(2)`

C

`AgNO_(3)`

D

`Cd(NO_(3))_(2)`

Text Solution

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The correct Answer is:
B
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