Assertion :The stability of peroxides and superoxides increases in passing from Li to Cs. Reason: The electropositive character of the elements in the periodic table increases on moving down a group.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Assertion is incorrect but Reason is correct.

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
The stability of peroxides and superoxides increases in passing from Li to Cs, because, as the size increases, the electropositive character of the elements in the periodic table increases on moving down a group. They can easily form superoxides and peroxides.

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