Lead is not affected by dil. HCl in the cold because :
Correct answer: D. Both A and C
- A. A protective coating of PbCl2 is formed on the metal
- B. Pb is less electropositive than H2
- C. PbO film is formed which resists chemical attack by the acid.
- D. Both A and C
Explanation
The correct answer is Option D. Lead is not affected by dilute HCl in the cold because both a protective coating of PbCl2 and a thin layer of lead oxide (PbO) are formed on the metal. These layers act as barriers that protect the lead from further reaction with the acid. Option A alone is not sufficient as PbO also plays a role in preventing the reaction. Option B is incorrect because the electropositivity comparison is not the primary reason for lead's lack of reaction with dilute HCl. Option C is partially correct but does not provide the complete explanation.
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The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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