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Question

Colourless solution of the following four salts are placed separately in four different test tubes and a strip of copper is dipeed in each one of these. Which solution will turn blue?

A
KNO3
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B
AgNO3
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C
Zn(NO3)2
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D
ZnSO4
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Solution

The correct option is A AgNO3
Option (B) is correct.
AgNO3 will turn the copper solution blue. Blue colour is due to formation of Cu2+ ions. Silver comes above copper in the electrochemical series. Zn and K are placed below copper in electrochemical series. Thus copper can displace silver ions from its salt solution but K and Zn cannot displace silver ions from its salt solution.

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