Assertion :Sodium reacts with oxygen to form $N a_{2} O_{2}$ but postassium reacts with oxygen to form $K O_{2}$ . Reason: Potassium is more reactive metal than sodium.

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 B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Because of the less size of sodium, it combines with less amount of oxygen leading to the formation of sodium peroxide but potassium is having a bigger size than sodium forms superoxide.
Potassium is more reactive metal than sodium. But this is not the correct reason for the potassium to form superoxide and sodium to form peroxide.
So, Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Hence option $B$ is correct.

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