Chemistry
A strip of copper is placed in four different colourless salt solutions. They are KNO3, AgNO3, Zn(NO3)2, Ca(NO3)2. Which one of the solutions will finally turn blue.
Metallurgy
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Answer
Silver Nitrate (AgNO3)
Reason — Copper displaces silver from AgNO3 soln. forming the blue copper [II] nitrate soln.
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