Q.

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

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Pb(NO3)2

Zn(NO3)2

AgNO3

Cd(NO3)2

answer is C.

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Detailed Solution

EZn+2/ZnoCd>Pb>H2>Cu>AgBlue colour is due to formation of Cu+2 which is possible when Cu looses 2 electrons. All electrodes having SRP values lesser than SRP of Cu reduces Cu+2 and that electrode having SRP greater than SRP of Cu oxidises Cu metal to Cu+2.SRP of Ag electrode is more than SRP of Cu electrode hence AgNO3 solution turns to blue.

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