Which of the following elements of IIA group is so reactive that it must be stored under oil to keep it out of contact with air?
Correct answer: D. Ba
- A. Mg
- B. Ca
- C. Sr
- D. Ba
Explanation
Barium is a highly reactive metal that requires storage under oil to prevent contact with air. When exposed to air, barium forms a protective layer of barium oxide. However, if this layer is compromised, barium can react explosively with oxygen. Magnesium, calcium, and strontium are also reactive elements in Group IIA but do not require oil storage like barium.
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About s-Block and p-Block Elements
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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