Ncert Solutions For Class 12 Chemistry Chapter 15 | Download Free PDF

Ncert Solutions For Class 12 Chemistry Chapter 15 in English

Adda247 provides NCERT Solutions for Class 12 Chemistry Chapter 15. The NCERT Solutions provided here will enhance the concepts of the students, as well as suggest alternative methods to solve particular problems to the teachers.

NCERT Solutions are drafted by the faculty at Adda247 to help students learn all the complex concepts efficiently. NCERT Textbooks are answered in a systematic format to help the students learn in a shorter duration. These solutions are tailored by vast research to make it easier for the students to complete the whole syllabus before board exams. A lot of materials are available online but it is very important for the students to understand their needs and find it accordingly. For this purpose, we at Adda247 provided both online and offline formats of the solutions completely based on the latest syllabus of the CBSE board.

Chemistry NCERT Solutions Class 12 includes a number of topics that offer students an in-depth knowledge of different aspects of Chemistry. To distinguish the equations and chemical formulas, after solving the NCERT chemistry class 12 PDF can be handy. The solution provided by Adaa247 is available in an easily downloaded format.

You can refer to the chemistry class 12 solutions for better solutions and score good marks in board as well as competitive exams.

Benefits of Solutions of NCERT class 12 Chemistry:

• NCERT Solutions for Class 12 is helpful to solve questions from other reference books too.
• NCERT Solutions for Class 12 Chemistry will assist students to cross-check answers and prepare for the exams in a strategic way.

The students can access the solutions anywhere while browsing the web easily. The solutions are very precise and accurate.

NCERT Solution of Chemistry Class 12 Chapter 15: Polymers

Polymers are large macromolecules made from monomers through a process called Polymerization. In Polymers Class 12 NCERT PDF students will learn about the different classes of Polymers and the different types of Polymerization processes.

Polymer, any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, that are multiples of simpler chemical units called monomers. Polymers make up many of the materials in living organisms, including, for example, proteins, cellulose, and nucleic acids.

Polymers are used in almost every area of modern living. Grocery bags, soda and water bottles, textile fibers, phones, computers, food packaging, auto parts, and toys all contain polymers. Even more-sophisticated technology uses polymers.

There are many types of polymers including synthetic and natural polymers.

Synthetic polymers are human-made polymers. They can be classified into four main categories: thermoplastics, thermosets, elastomers, and synthetic fibers. They are commonly found in a variety of consumer products.

Natural polymers include silk, hair, proteins and DNA, while synthetic (man-made) polymers include polyethylene, polypropylene, and polyester. Addition polymerization is the creation of a polymer by adding together monomers in a repeating pattern, with no resulting by-product.

Polymers are more resistant to chemicals than their metal counterparts. Polymer parts do not require post-treatment finishing efforts, unlike metal. Polymer and composite materials are up to ten times lighter than typical metals. Polymers are naturally radar-absorbent as well as thermally and electrically insulating.

The chapter then goes on to explain the different categories of monomers. Following these, the chapter highlights the preparation of different types of Polymers and their properties.

After this, students will learn about the use of polymers in everyday life. They can make use of Polymers Class 12 NCERT Solutions to further increase knowledge and expertise.

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Key features of NCERT Solutions for Class 12 Chemistry

• It provides a complete overview of the chapter.
• Comes handy when revising.
• The complex subject of Biomolecules is explained in simple language.
• Clear doubts that may arise while going through the chapter.
• Helps in preparation of not only board exams but also in other competitive exams.

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Important questions of NCERT Solutions for Chemistry Chapter 15

1 Explain the terms polymer and monomer.

Answer:

Polymers are high molecular mass macromolecules composed of repeating structural units derived from monomers. Polymers have a high molecular mass. In polymers, various monomer units are joined by strong covalent bonds. Polymers can be natural as well as synthetic. Polythene, rubber, and nylon6,6 are examples of polymers. Monomers are simple, reactive molecules that combine with each other in large numbers through covalent bonds to give rise to polymers. For example ethene, propene, vinyl chloride.

2 What are natural and synthetic polymers? Give two examples of each type.

Answer:

Natural polymers are polymers that are found in nature. They are formed by plants and animals. Examples include proteins, cellulose, starch, etc. synthetic polymers are polymers made by human beings. Examples include plastics, synthetic fibers, synthetic rubber, etc.

3 Distinguish between the terms homopolymer and copolymer and give an example of each.

Answer:

4 How do you explain the functionality of a monomer?

Answer:

The functionality of a monomer is the number of binding sites that is/are present in that monomer.

For example, the functionality of monomers such as ethene and propene is one and that of 1,3-butadiene and adipic acid is two.

5 Define the term polymerisation.

Answer:

Polymerization is the process of forming high molecular mass macromolecules, which consists of repeating structural units derived from monomers. In a polymere, various monomer units are joined by strong bonds.

6 Is (NH-CHR-CO)n, a homopolymer or completely?

Answer:

(NH-CHR-CO), is homopolymer, because it is obtained from a single monomer unit,

NH₂-CHR-COOH

7 In which classes, the polymers are classified on the basis of molecular forces?

Answer:

On the basis of magnitude of intermolecular forces present in the polymers, they are classified into the following groups;

• Elastomers.
• Fibers.
• Thermoplastic polymers.
• Thermosetting polymers.

8 How can you differentiate between addition and condensation polymerisation?

Answer:

9 Define thermoplastic and thermosetting polymers with two examples of each.

Answer:

Thermoplastic polymers are linear long chain polymers, which can be repeatedly softened and hardened on heating. Hence, they can be modified again and again.

Examples include polythene, polystyrene.

Thermosetting polymers are cross-linked or heavily branched polymers which get hardened during the moulding process. These plastics cannot be softened again on heating. Examples of thermosetting plastics include Bakelite, urea – formaldehyde.

10 Discuss the main purpose of vulcanisation of rubber.

Answer:

Natural rubber though useful has some problems associated with its use. These limitations are discussed below:

1. Natural rubber is quite soft and sticky at room temperature. At elevated temperatures (> 335 K), it becomes even softer. At low temperatures (< 283 K), it becomes brittle. Thus, to maintain its elasticity, natural rubber is generally used in the temperature range of 283 K-335 K.
2. It has the capacity to absorb large amounts of water.
3. It has low tensile strength and low resistance to abrasion.
4. It is soluble in non-polar solvents.
5. It is easily attacked by oxidizing agents.

Vulcanization of natural rubber is done to improve upon all these properties. In this process, a mixture of raw rubber with sulphur and appropriate additive is heated at a temperature range between 373 K and 415 K.

This is a slow process, therefore some additives like zinc oxide etc. are used to accelerate the process. During this process, sulphur cross links are formed which makes rubber hard, tough with greater tensile strength .The vulcanized rubber has excellent elasticity, low water absorption, resistance to oxidation & organic solvents.

11 Write the monomers used for getting the following polymers.

1. Polyvinyl chloride
2. Teflon

III.       Bakelite

Answer:

i.)         Vinyl chloride (CH2=CHCl)

ii.)        Tetreafluoroethylene (CF2=CF2)

iii.)       Formaldehyde (HCHO) and phenol (C6H5OH)

Frequently asked questions on NCERT Solutions for Chemistry Chapter 15

1. What are the types of polymerization reactions covered in Chapter 15 of NCERT Solutions for Class 12 Chemistry?

Ans. The types of polymerization reactions covered in Chapter 15 of NCERT Solutions for Class 12 Chemistry are –

• Addition polymerization includes three steps

Chain initiation

Chain propagation

Chain termination

• Condensation polymerization is also known as step-growth polymerization.

2. What are the topics discussed in Chapter 15 of NCERT Solutions for Class 12 Chemistry?

Ans. The topics discussed in Chapter 15 of NCERT Solutions for Class 12 Chemistry are –

• Classification of Polymers
• Types of Polymerization Reactions
• Molecular Mass of Polymers
• Biodegradable Polymers
• Polymers of Commercial Importance.

3. What is the mark weightage of Polymers?

Ans. There are a total of three questions that come from polymers. One question comes from the very short type answers of 1 mark. Two questions come from the short answer-type questions. So, in total, there are three marks worth of questions that can come from here.

Polymer is a chapter that can be prepared towards the end. It has many essential definitions, but it can be quickly done towards the end. Students can then make use of Class 12 Chemistry Chapter 15 NCERT Solutions to build up their confidence further in the subject.

Polymers class 12 NCERT Solutions will help students as they go through their preparation.

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