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Colourless solutions of the following four salts are placed separately in four different test tubes and a strip of copper is dipped in each one of these. Which solution turns blue.

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Zn(NO₃)₃

AgNO₃

ZnSO₄

KNO₃

answer is B.

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Detailed Solution

AgNO₃ turns blue due to aqueous Cu(NO₃)₂ which has blue color. Cu is more reactive than Ag and thus displaces from its compound.

2AgNO₃ + Cu → Cu(NO₃)₂(aq) + 2Ag

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