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(D) Among the alkaline earth metals,the tendency to form peroxides increases down the group as the size of the metal cation increases and the lattice

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Barium

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(D) Among the alkaline earth metals,the tendency to form peroxides increases down the group as the size of the metal cation increases and the lattice energy becomes more favorable for the larger peroxide ion $(O_2^{2-})$.$Be$ and $Mg$ form only oxides $(MO)$.$Ca$ and $Sr$ form peroxides $(MO_2)$ to a limited extent.$Ba$ has the largest size among the given options and forms $BaO_2$ (Barium peroxide) most readily.

Which of the following elements has the highest tendency to form a peroxide?

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