Assertion : $N a_{2} O$ is more basic than $A l_{2} O_{3}$ . Reason: Sodium is less electropositive than aluminium.

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 C Assertion is correct but Reason is incorrect
$N a_{2} O$ is more basic oxide. The trend of basicity is from strongly basic oxides on the left-hand side to strongly acidic ones on the right, via an amphoteric oxide (aluminium oxide) in the middle.
Sodium is more electropositive than Aluminium.
Hence option C is correct answer.

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Assertion :Na2O is more basic than Al2O3. Reason: Sodium is less electropositive than aluminium.

Assertion : $N a_{2} O$ is more basic than $A l_{2} O_{3}$ . Reason: Sodium is less electropositive than aluminium.