Which of following metals can be displaced by all other metals from its solution ?
Correct answer: C. Au
- A. Ag
- B. A
- C. Au
- D. Cu
Explanation
Gold is below the other listed metals in the activity series, so metals such as aluminium, copper and silver can displace gold ions from solution. The less reactive metal is displaced by the more reactive metal. The likely mistake is choosing Ag, because silver is also relatively unreactive, but gold is still less reactive than silver.
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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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