Which of the following cannot be displaced from their salt solution by copper?
Correct answer: D. Zn
- A. Ag
- B. AU
- C. Pt
- D. Zn
Explanation
A more reactive metal can displace a less reactive metal from its salt in an aqueous solution. Since copper is less reactive than zinc, therefore it cannot displace Zinc from its salt solution. But copper is more reactive than mercury, silver and gold hence can replace than from their respective salt solutions.
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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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