Assertion :
The $N - N$ bond distance in $N$ is shorter than the $N - N$ bond distance in $N_{2} H_{4}$ .
Reason: The atomic radius of $H$ is smaller than the atomic radius of $N$ .

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
Bond between N atoms in $N_{2}$ is triple bond whereas bond between N atoms in $N_{2} H_{4}$ is double bond.
Triple bond is always shorter than double bond.

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Assertion :The N−N bond distance in N is shorter than the N−N bond distance in N2H4. Reason: The atomic radius of H is smaller than the atomic radius of N.

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for AssertionBond between N atoms in N2 is triple bond whereas bond between N atoms in N2H4 is double bond.Triple bond is always shorter than double bond.

Assertion :
The $N - N$ bond distance in $N$ is shorter than the $N - N$ bond distance in $N_{2} H_{4}$ .
Reason: The atomic radius of $H$ is smaller than the atomic radius of $N$ .

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
Bond between N atoms in $N_{2}$ is triple bond whereas bond between N atoms in $N_{2} H_{4}$ is double bond.
Triple bond is always shorter than double bond.