Beryllium becomes passive on reaction with conc. HNO3 because:
Correct answer: B. It forms stable layer of oxide
- A. It is non-reactive metal
- B. It forms stable layer of oxide
- C. It has non-reactive nature with the acid
- D. It has small size
Explanation
Beryllium becomes passive on reaction with concentrated nitric acid (HNO3) because it forms a thin, protective layer of beryllium oxide (BeO) on the surface of the metal. This layer of oxide is very inert and prevents further reaction of the metal with the acid. The other options are incorrect because they do not address the specific mechanism of how beryllium becomes passive when reacting with the acid.
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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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