Class 10 Chemistry Chapter 26: Polymers – Class Test 5 is part of the Chapter-Wise Test Series for Punjab Board 2027 Model Papers. This test covers topics 26.1 to 26.3 from the new Class 10 Chemistry syllabus issued by PECTAA Punjab. Students can use this chapter-wise Chemistry test to prepare for their annual examinations, strengthen their understanding of Polymers, and assess their knowledge according to the latest Punjab Board syllabus. These model tests are designed to support effective exam preparation for Class 10 students.
Chapter Wise Class TestT-37Chapter-26Polymers
1.1 Choose the correct Answer.(Time: 7 Minutes)(Total Marks: 8)
1.
Polymers are formed by joining a large number of small units called.
(a) Atoms(b) Elements(c) Molecule(d) Monomer
Ans: (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
Ans: (c) High strength and chemical resistance
3.
Addition Polymers are formed from monomers containing bonds.
(a) single(b) Double(c) Triple(d) close chain
Ans: (b) Double
4.
In condensation Polymers, which monomer eliminate?
(a) HCl(b) CO2(c) N2(d) O2
Ans: (a) HCl
5.
In Polyamide condensation, the bond is formed.
(a) H2(b) amide linkage(c) Ionic(d) Metallic
Ans: (b) amide linkage
6.
Teflon is mainly used as:
(a) Electrical conductors(b) Adhesive(c) Non stick coating(d) Fertilizer
Ans: (c) Non stick coating
7.
Which one of following is addition polymer?
(a) Nylon -6,6(b) PET(c) Poly amide(d) Polythene
Ans: (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
Ans: (a) Type and proportion of monomers
Chapter Wise Class TestT-37Chapter-26Polymers
Total Marks: 17(Subjective Type)Time: 33 Minutes
2.
Write short answers to any six (6) questions.
[6 × 2 = 12]
(i)
What are Polymers?
Ans: Polymers are very large molecules made by joining a large number of small repeating units, called monomers, through covalent bonds. Examples: polythene, PVC, nylon.
(ii)
What is an addition polymers?
Ans: An addition polymer is formed by the repeated addition of monomer molecules that contain a double bond (unsaturated monomers). No small molecule is lost. Example: polythene from ethene.
(iii)
How does condensation polymerization reaction occur?
Ans: Monomers having two functional groups react step by step. Each time two monomers join, a small molecule such as H2O or HCl is eliminated, and a linkage (amide or ester) is formed between the units.
(iv)
How is condensation polymer formed from a diamine and dicarboxylic acid?
Ans: The −NH2 group of the diamine reacts with the −COOH group of the dicarboxylic acid and eliminates H2O (or HCl if the acid chloride is used), forming an amide linkage (−CONH−). The reaction continues at both ends and gives a polyamide, e.g. Nylon-6,6.
(v)
Write any two characteristics properties of addition polymerization.
Ans: (1) The monomers contain a double bond. (2) No by-product is eliminated, so the polymer has the same empirical formula as the monomer. (3) It is a chain reaction.
(vi)
How starting monomer are prepare from addition monomer?
Ans: The starting monomers, such as ethene and propene, are obtained from petroleum and natural gas by cracking hydrocarbons. Other monomers, e.g. vinyl chloride, are then prepared from them by further reactions.
(vii)
Write the specific properties of polymer.
Ans: The properties of a polymer, such as strength, flexibility, melting point and chemical resistance, depend on the type and proportion of monomers, the chain length and structure (linear, branched or cross-linked), and the method of polymerization.
(viii)
What do you understand by the term repeating unit?
Ans: The repeating unit is the smallest group of atoms that repeats again and again along the polymer chain. For polythene it is −CH2−CH2−, written as [−CH2−CH2−]n.
(ix)
Why does Polymerization continue at both ends?
Ans: Because the monomers have reactive functional groups at both ends, the growing chain always has a reactive end. New monomers keep joining at both ends until the monomers are used up.
Note: Attempt any one question.[5 × 1 = 5]
3.
What is polymerization? Give its importance.
Ans: Polymerization is the chemical process in which a large number of small monomer molecules join together to form a large polymer molecule.
Importance: It is used to make plastics, synthetic fibres, rubber, packaging, pipes, coatings and adhesives. Polymers are light, strong, cheap and resistant to chemicals, so they are used in homes, industry and medicine.
4.
Write the Differences between Addition and Condensation Polymerizations.
Point
Addition Polymerization
Condensation Polymerization
Monomers
Contain a double bond (unsaturated), e.g. ethene
Contain two functional groups, e.g. diamine and dicarboxylic acid
