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  4. Assertion: Na2O is basic oxide whereas Cl2O7 is acidic oxide. Reason: Elements on extreme left form basic oxides whereas elements on extreme right form acidic oxides.

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Q. Assertion : $Na_{2}O$ is basic oxide whereas $Cl_{2}O_{7}$ is acidic oxide.
Reason: Elements on extreme left form basic oxides whereas elements on extreme right form acidic oxides.

Classification of Elements and Periodicity in Properties

Solution:

$Na_{2}O$ with water forms a strong base whereas $Cl_{2}O_{7}$ forms strong acid.
$Na_{2}O+H_{2}O \to 2NaOH$
$Cl_{2}O_{7}+H_{2}O \to 2HClO_{4}$