Which of the elements show passivity when treated with conc. HNO3?
Correct answer: D. All of the above
- A. Fe
- B. A
- C. Cr
- D. All of the above
Explanation
Concentrated HNO3 passivates Fe, Cr, and Al by forming a thin, protective oxide film on their surfaces, which prevents further reaction. Fe alone is the likely wrong choice because it is the most familiar example, but chromium and aluminium also become passive.
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About Periodic Properties and Trends
Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.
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