Prepare for the Class 10 Chemistry Chapter 26: Polymers – Test 5, designed according to the latest Punjab Board 2027 Model Papers and the new Chemistry syllabus issued by PECTAA Punjab. This first half unit test covers textbook topics 26.1 to 26.3 and is part of our comprehensive Class 10 Chemistry Chapter Wise Test Series. Students can use this chapter-based assessment to strengthen their understanding of polymers, practice important textbook concepts, evaluate their preparation, and improve their performance in upcoming Punjab Board Matric examinations 2027. Visit 786Times.com for more Class 10 Chemistry tests, model papers, and examination preparation resources.
Chapter Wise Class Test
T-5
Chapter-26
Polymers
1.Polymers are formed by joining a large number of small units called.
(a) Atoms(b) Elements(c) Molecule(d) Monomer
Answer: (d) Monomer
2.Polymers are widely used because they have:
(a) Low strength(b) Poor flexibility(c) High strength and chemical resistance(d) High cost
Answer: (c) High strength and chemical resistance
3.Addition Polymers are formed from monomers containing bonds.
(a) single(b) Double(c) Triple(d) close chain
Answer: (b) Double
4.In condensation Polymers, which monomer eliminate?
(a) HCl(b) CO2(c) N2(d) O2
Answer: (a) HCl (a small molecule such as HCl or H2O is eliminated)
5.In Polyamide condensation, the bond is formed.
(a) H2(b) amide linkage(c) Ionic(d) Metallic
Answer: (b) amide linkage
6.Teflon is mainly used as:
(a) Electrical conductors(b) Adhesive(c) Non stick coating(d) Fertilizer
Answer: (c) Non stick coating
7.Which one of following is addition polymer?
(a) Nylon -6,6(b) PET(c) Poly amide(d) Polythene
Answer: (d) Polythene
8.Specific properties that shows monomer depend upon.
(a) Type and proportion of monomers(b) Colour of Polymer(c) Method of Storage(d) Atmospheric condition
Answer: (a) Type and proportion of monomers
Chapter Wise Class Test
T-5
Chapter-26
Polymers
2. Write short answers to any six (6) questions.[6 × 2 = 12]
(i)
What are Polymers?
Polymers are giant molecules formed by joining a large number of small repeating units (monomers) through covalent bonds. Example: polythene.
(ii)
What is an addition polymers?
A polymer formed by the repeated addition of monomers containing a double bond, without loss of any small molecule. Example: n CH2=CH2 → [−CH2−CH2−]n (polythene).
(iii)
How does condensation polymerization reaction occur?
Monomers having two functional groups join together, and a small molecule such as H2O or HCl is eliminated at every step of the reaction.
(iv)
How is condensation polymer formed from a diamine and dicarboxylic acid?
The −NH2 group of the diamine reacts with the −COOH group of the dicarboxylic acid, eliminating H2O and forming an amide linkage (−CONH−). Repetition gives a polyamide such as Nylon-6,6.
(v)
Write any two characteristics properties of addition polymerization.
1) Monomers contain a double bond (C=C). 2) No small molecule is eliminated, so the polymer has the same empirical formula as the monomer.
(vi)
How starting monomer are prepare from addition monomer?
Starting monomers such as ethene (CH2=CH2) and propene are obtained from petroleum and natural gas by cracking of hydrocarbons.
(vii)
Write the specific properties of polymer.
They depend on the type and proportion of monomers used and the method of polymerization; e.g. strength, flexibility, chemical resistance and melting point.
(viii)
What do you understand by the term repeating unit?
The smallest structural unit that repeats again and again along the polymer chain, e.g. [−CH2−CH2−] in polythene.
(ix)
Why does Polymerization continue at both ends?
Because each monomer in condensation polymerization has two reactive functional groups, so the chain keeps growing from both of its ends.
Note: Attempt any one question.[5 × 1 = 5]
3.
What is polymerization? Give its importance.
Polymerization is the process in which many small monomer molecules combine to form a large polymer molecule.
Importance: it produces plastics, synthetic fibres (nylon, polyester), rubber, Teflon coatings and packaging materials that are strong, light, flexible, chemically resistant and cheap to make.
Importance: it produces plastics, synthetic fibres (nylon, polyester), rubber, Teflon coatings and packaging materials that are strong, light, flexible, chemically resistant and cheap to make.
4.
Write the Differences between Addition and Condensation Polymerizations.
| Addition polymerization | Condensation polymerization |
|---|---|
| Monomers contain a double bond | Monomers contain two functional groups |
| No small molecule is eliminated | A small molecule (H2O, HCl) is eliminated |
| Chain growth reaction | Step growth reaction |
| Example: Polythene, Teflon | Example: Nylon-6,6, PET |
