Silver nitrate solution turns blue when a piece of copper is added to it. This is because of
Correct answer: C. Oxidation of Cu
- A. Oxidation of Ag
- B. Reduction of Cu
- C. Oxidation of Cu
- D. Ionization of Ag
Explanation
When copper wire is placed in silver nitrate solution then the solution becomes blue colored. We will use electrochemical series to solve the question. Copper is more reactive than silver. Hence when the copper wire is dipped in silver nitrate solution it displaces silver from silver nitrate (AgNO3) solution forming copper nitrate which is bluish-green.This is a displacement reaction. A shining gray-white deposit of silver is formed on the copper strip and therefore the solution becomes bluish-green because of the formation of copper nitrate. We observe that the solution becomes blue
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About Oxidation and Reduction
Oxidation involves loss of electrons, increase in oxidation number or addition of oxygen, while reduction involves electron gain, decrease in oxidation number or removal of oxygen. The topic covers oxidising and reducing agents, oxidation-number changes, redox equations and the distinction between oxidation at the anode and reduction at the cathode.
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