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
Answer
Silver Nitrate (AgNO3)
Reason — Copper displaces silver from AgNO3 soln. forming the blue copper [II] nitrate soln.
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