Which alkaline earth metal form peroxides?
Correct answer: A. Ba
- A. Ba
- B. Be
- C. Mg
- D. Ca
Explanation
The alkaline earth metals burn in oxygen to produce oxides or in the case of barium, peroxide. It is the most reactive among the other members of group II. When barium is heated in air or oxygen at 500-600°C, its peroxide is formed according to the equation:Ba (s) + O2 (g) -----------------> BaO2 (s)Therefore the correct answer is option A. The rest of the elements form normal oxides, therefore B,C and D are incorrect, as per the following equations:Be + O2 --------------> BeO (occurs at about 800°C since Be is the least reactive)Mg + O2 --------------> MgO (this MgO coats the surface and prevents further corrosion)Ca + O2 ---------------> CaO
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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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