Which of the following pair of elements of IIA group form peroxide when treated with oxygen?
Correct answer: C. Ba and Sr
- A. Be and Mg
- B. Ca and Ba
- C. Ba and Sr
- D. Sr and Ca
Explanation
Barium and Strontium are the elements in Group IIA that form peroxides when treated with oxygen. Barium forms BaO2 and Strontium forms SrO2. The other options, Be and Mg, Ca and Ba, as well as Sr and Ca, do not both form peroxides when reacting with oxygen.
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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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