CBSE Class 11 Chemistry NCERT Solutions: Chapter 11, The p-Block Elements

The NCERT solutions for class 11 Chemistry chapter, The p-Block Elements, given here are all explained by the subject experts and form the best source of practice to learn Chemistry. Preparing for the exams will become easier and simpler by following the NCERT solutions given here.

Created On: Sep 13, 2018 11:00 IST
The p-Block Elements: NCERT Solutions
The p-Block Elements: NCERT Solutions

There are given a number of practice problems at the end of each chapter in NCERT books. These problems are designed in different formats to help students acquaint the kind of questions asked in the exams. Also solving the NCERT questions helps students assess their learning and know the areas which need to be worked on. Practicing a variety of questions helps to strengthen the fundamentals of a topic which makes students efficient in solving different questions asked in exams based on that particular topic. Therefore, students are suggested to solve all the NCERT questions and learn to write perfect solutions which will help them score good marks in exams.

To help students find the right approach to solve the class 11 Chemistry NCERT questions, we have collated detailed and accurate solutions. Our subject experts have reviewed these NCERT solutions to provide you the error free content which will helps to make an effective preparation for the annual exams.

CBSE Class 11 Chemistry NCERT Solutions for Chapter- The p-Block Elements

Here we are providing NCERT solutions for CBSE Class 11 Chemistry Chapter 11, The p-Block Elements. All the questions have been solved in the most appropriate and simple way so as to help students access the right study material for the exam preparation.

Students may download the NCERT solutions for Class 11 Chemistry in PDF format. 

Main topics discussed in Class 11 Chemistry chapter- The p-Block Elements are:

  • Group 13 elements: The boron family
  • Physical and chemical properties of boron family
  • Important trends and anomalous properties of boron
  • Some important compounds of boron


             orthoboric acid

             diborane, B2H6

  • Uses of boron and aluminium and their compounds
  • Group 14 elements: The carbon family
  • Physical and chemical properties of carbon family
  • Important trends and anomalous behaviour of carbon
  • Allotropes of carbon
  • Uses of carbon
  • Some important compounds of carbon and silicon

              Carbon monoxide

              Carbon dioxide

              Silicon dioxide, SiO2




 CBSE Class 11 Chemistry Syllabus 2018 - 2019

Some of the questions and their solutions from NCERT Solutions for Class 11: The p-Block Elements, are as follows:

Q. How can you explain the higher stability of BCl3 as compared to TlC13?

Sol. The decrease in the stability of +3 oxidation state is due to the increase in the inert pair effect down the group from B to Tl. Due to this increasing inert pair effect, out of ns2np1 only np1 will take part in bond formation in Tl. Therefore, +3 oxidation state in Tl will not be stable. Hence BCl3is more stable as compared to TiCl3.

Q. Why does boron triflouride behave as a Lewis acid?

Sol. BF3 has six elections in the outermost orbit of boron atom hence it is electron deficient. Thus, it reacts with a Lewis base and accepts a pair of electrons to complete the octet around boron. Hence it behaves as a Lewis acid.

Q. Suggest a reason as to why CO is poisonous.

Sol. Carbon monoxide is considered to be highly-poisonous because of its ability to form a complex with haemoglobin, the oxygen carrier of the blood,. The CO-Hb complex, also known as the carboxy-haemoglobin, is more stable than the oxy-haemoglobin complex. Thus the former prevents haemoglobin from binding with oxygen. As a result, the oxygen transportation is disturbed and thus the tissues do not get the necessary oxygen, which may ultimately lead to the death of a person.

Q. How is excessive content of CO2 responsible for global warming?

Sol. Carbon dioxide has the ability to trap the infra- red rays reflected by the earth. Since the infra- red rays have a heating effect. So the atmosphere gets heated up producing the greenhouse effect. So, higher the level of carbon dioxide, the higher is the amount of heat trapped. Hence higher will be the temperature of the atmosphere, thereby causing global warming.

 Download all the NCERT solutions for Class 11: The p-Block Elements, from the following link:

Class 11 Chemistry NCERT Solutions: The p-Block Elements

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