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Several representative metals such as aluminum, zinc, and tin react only slowly with air. This slow reactivity is due to a protective-coating effect called:
Aamalgamation
Bdisproportionation
Cpassivation
Dhybridization
Answer & Solution
Correct answer: C. passivation
1. Metals that survive in air despite being reactive typically do so by forming a barrier that blocks further reaction.
2. The text explains: "these elements react with air to form a protective coating. The formation of this protective coating is passivation."
3. Amalgamation refers to alloying with mercury, disproportionation is a redox process, and hybridization concerns orbital mixing -- none describes this protective-film effect.
4. So the correct term for this air-stable protective oxide coating is passivation.
_Source: OpenStax Chemistry Ch 18 "Representative Metals, Metalloids, and Nonmetals", p.964 §18.1 Periodicity_
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