A strip of copper is dipped into a colourless solution of the following four salts, which are placed separately in four different test tubes. Which solution will turn Blue?

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When a strip of copper is dipped in the solution of silver nitrate, the solution becomes blue. C u is placed above A g in electrochemical series. 2 A g N O 3 + C u → C u ( N O 3 ) 2 + 2 A g

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