Assertion :Nitrogen in unreactive at room temperature but becomes reactive at elevated temperatures (on heating or in the presence of catalysts). Reason: In nitrogen molecule, there is extensive delocalisation of electrons.

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
Assertion
Nitrogen is chemically unreactive at room temperature due to high bond enthalpy of $N \equiv N$ bond but becomes reactive at elevated temperatures (on heating or in the presence of catalysts).
Reason
In nitrogen molecule, there is no delocalisation of electrons. The bond paris of electrons are localised between two N atoms. The lone pairs of electrons are localised on each N atom.

Assertion is correct but Reason is incorrect.

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Similar questions

Q. Assertion :Nitrogen is unreactive at room temperature but becomes reactive at elevated temperature (on heating) or in the presence of catalysts. Reason: In nitrogen molecule, there is extensive delocalisation of electrons.

Q. Assertion: Nitrogen in unreactive at room temperature but becomes reactive at elevated temperatures (on heating, or in the presence of a catalysts).

Reason: In nitrogen molecule, there is extensive delocalisation of electrons.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum

{2n}^{2}

electrons.

Assertion (A) The enthalpy of reaction remains constant in the presence of a catalyst.

Reason (R) A catalyst participating in the reaction forms different activated complex and lowers down the activation energy but the difference in enrgy of reactant and product remains the same.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

Assertion (A) Phenol forms 2, 4, 6-tribromophenol on treatment with $B r_{2}$ in carbon disulphide at 273K.
Reason (R) Bromine polarises in carbon disulphide.
(a) Assertion and reason both are correct and reason is correct explanation of assertion.
(b) Assertion and reason both are wrong statements.
(c) Assertion is correct statement but reason is wrong statement.
(d) Assertion is wrong statement but reason is correct statement.
(e) Both assertion and reason are correct statements but reason is not correct explanation of assertion.

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