Colourless solutions of the following four salts are placed separately – InterviewSolution

1.	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 will turn blue ?
Answer» `KNO_3` `AgNO_3` `ZN(NO_3)_2` `ZnSO_4` ANSWER :B

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