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Four colourless salt solutions are taken in separate test tubes and a copper strip is dipped in each. Which solution will turn blue?
- KNO3
- AgNO3
- Zn(NO3)2
- ZnSO4
Correct answer: AgNO3
Solution
Copper is more reactive than silver, so it displaces silver from AgNO3, forming blue Cu(2+) ions in solution.
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