Assertion : $K, R b$ and $C s$ form superoxides. Reason: The stability of the superxides increases from $^{'} K^{'}$ to $^{'} C s^{'}$ due to decrease in lattice energy.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
K, Rb, Cs from superoxides when they are burned in the air .as we move down the group, the size of an atom from k to Cs increases so, lattice energy decreases and hence the stability of superoxide also decreases.

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