Assertion : $N O_{2}$ is reddish brown and its dimer $N_{2} O_{4}$ is colourless Reason: There is a dative bond formation between two $N O_{2}$ molecules

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
$N O_{2}$ is a brown color gas and $N_{2} O_{4}$ is colorless solid. In $N_{2} O_{4}$ , there is no dative bond between two $N O_{2}$ molecules. It is the bond formed by a single electron on $N$ atom in $N O_{2}$ with two $N O_{2}$ molecules. Assertion is correct but reason is wrong.

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Assertion :NO2 is reddish brown and its dimer N2O4 is colourless Reason: There is a dative bond formation between two NO2 molecules

Assertion : $N O_{2}$ is reddish brown and its dimer $N_{2} O_{4}$ is colourless Reason: There is a dative bond formation between two $N O_{2}$ molecules