Why is N2 less reactive at room temperat | Class 12 Chemistry Chapter The p-Block Elements, The p-Block Elements NCERT Solutions

Previous / historical NCERT chapter

This chapter belongs to a previous NCERT/CBSE curriculum and is not part of the current 2026-27 chapter list. Removed in 2022-23.

Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter The p-Block Elements. This page offers a step-by-step solution to the specific question from Exercise 1, Question 3:

Why is N2 less reactive at room temperature?

. With detailed answers and explanations for each chapter, students can strengthen their understanding and prepare confidently for exams. Ideal for CBSE and other board students, this resource will simplify your study experience.

Question 3:

Why is N2 less reactive at room temperature?

Answer:

 Dinitrogen (N2) IS formed by sharing three electron pairs between two nitrogen atoms.The two nitrogen atoms are joined by triple bond(N≡N). The nitrogen atom is very small in size ,therefore the bond length is also quite small(109.8 pm) & as a result the bond dissociation energy is quite high(946Kj / mol).This reason leads N2 to be very less reactive at room temperature.


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  • Read the question carefully and focus on the core concept being asked.
  • Reference examples and data from the chapter when answering questions about The p-Block Elements.
  • Review previous year question papers to get an idea of how such questions may be framed in exams.
  • Practice answering questions within the time limit to improve your speed and accuracy.
  • Discuss your answers with your teachers or peers to get feedback and improve your understanding.

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Comments

  • Aman singh
  • May 10, 2019

If the size is small then the bond dissociation enthelpy or energy is high due to the the electrons are tightly bonded and having stronger nuclear charge bcz only the number ofelectrons are much as compared to their size


  • MANMOHIT
  • Dec 19, 2018

Give the increasing order acidic stronger of hclo ,hclo2, hclo3 ,hclo4?


  • Ritik
  • Aug 18, 2018

Thanks


  • Suhas m
  • Feb 08, 2018

Thank u so much for helping


  • speedy
  • Nov 28, 2017

Excellent it is very useful


  • Akash Darshan
  • Feb 16, 2017

For boards, specific answer is required. Nitrogen forms pπ-pπ bond with other nitrogen due to small size and high electronegativity. Thus they exist as a very stable diatomic molecule with Bond enthalpy = 941.4kJ/mol which is very difficult to overcome. Thus they are stable at room temperature and less reactive


  • SATVIR SINGH
  • Dec 18, 2016

reply to simran question dinitrogen is unreactive at room temperature. The room temperature varies according to the conditions in which dintrogen is kept.But with the increase in temperature dintrogen reactivity increases.It Liquefies at 77 K and freezes at63 K


  • SIMRAN
  • Nov 10, 2016

NOT PROPER DUDE IF I ASK YOU AT WHAT TEMP IT REACT THAN WHAT YOU SAY


  • SATVIR SINGH
  • Mar 25, 2016

The nitrogen atom is small in size but the two nitrogen atoms are attached to each other by tripple bond.So three bonds have to be broken to make N2 reactive ,as a result the bond dissociation energy is high.


  • Faryal
  • Mar 25, 2016

If the size is small then why is the bond dissociation energy high?


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Welcome to the NCERT Solutions for Class 12 Chemistry - Chapter . This page offers a step-by-step solution to the specific question from Excercise 1 , Question 3: Why is N2 less reactive at room temperature?....

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