Coinage metals (Cu, Ag and Au) are the least reactive because they have:
Correct answer: C. Positive reduction potential
- A. Negative reduction potential
- B. Negative oxidation potential
- C. Positive reduction potential
- D. Positive oxidation potential
Explanation
Coinage metals (Cu, Ag, and Au) are notable for their high positive reduction potentials. This property suggests that these metals are more inclined to gain electrons rather than lose them, which explains their low reactivity. They do not readily oxidize to form positive ions, hence their stability. Option A is incorrect because metals with negative reduction potentials are more reactive. Option B is incorrect because negative oxidation potential is not a relevant factor in this context. Option D is incorrect because positive oxidation potential implies reactivity, which does not apply to coinage metals.
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Electrochemistry describes electron transfer through oxidation and reduction, identifies oxidizing and reducing agents, and applies oxidation numbers to balance redox equations. It also covers electrode potential and the standard hydrogen electrode, which provides the reference for comparing the reduction tendencies of other electrodes.
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