Which of the following elements does not form peroxide?
A
Sr
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B
Na
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C
Na,K
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D
Li,Rb
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Solution
The correct option is CSr
Peroxide, any of a class of chemical compounds in which two oxygen atoms are linked together by a single covalent bond. Several organic and inorganic peroxides are useful as bleaching agents, as initiators of polymerization reactions, and in the preparation of hydrogen peroxide (q.v.) and other oxygen compounds.
Generally Alkali metals form peroxides in periodic table and hence option A is correct answer.