Polymers and plastics are a frequently asked topic in ECET 2026 Chemistry for CSE diploma students. Understanding their types, synthesis, and properties not only helps in scoring marks in general science questions but also builds a strong foundation for material science and applied chemistry concepts. This session will cover key points, followed by 10 expected MCQs with answers and explanations.
📘 Concept Notes – Polymers & Plastics
🧪 What are Polymers?
- Polymers are large molecules made by joining repeating units called monomers.
- Can be natural or synthetic.
- Examples: Natural – cellulose, proteins; Synthetic – nylon, polythene.
🧬 Types of Polymers
- Addition Polymers: Formed by addition reaction of monomers with double bonds.
- Example: Polyethylene (CH₂=CH₂ → -(CH₂-CH₂)-ₙ)
- Condensation Polymers: Formed by condensation reaction, releasing small molecules like water.
- Example: Nylon 6,6 (from hexamethylenediamine + adipic acid)
⚙️ Plastics
- Plastics are synthetic polymers that can be molded.
- Types of Plastics:
- Thermoplastics: Can be remelted & reshaped. Examples: PVC, polythene.
- Thermosetting Plastics: Hard & cannot be reshaped after forming. Examples: Bakelite, Melamine.
💡 Key Properties
- Lightweight, corrosion-resistant, and insulating.
- Applications: Packaging, electrical insulation, construction materials.
🔟 10 Most Expected MCQs – ECET 2026 [Polymers & Plastics]
Q1. Polymers are composed of:
A) Monomers
B) Dimers
C) Ions
D) Molecules
Q2. Nylon 6,6 is formed by which type of reaction?
A) Addition
B) Condensation
C) Substitution
D) Oxidation
Q3. Polyethylene is an example of:
A) Addition polymer
B) Condensation polymer
C) Natural polymer
D) Biopolymer
Q4. Which of the following is a thermosetting plastic?
A) PVC
B) Bakelite
C) Polythene
D) LDPE
Q5. Which plastic can be remelted and reshaped?
A) Thermosetting
B) Thermoplastic
C) Bakelite
D) Melamine
Q6. Cellulose is a:
A) Synthetic polymer
B) Natural polymer
C) Condensation polymer
D) Thermoplastic
Q7. Monomer of polystyrene is:
A) CH₂=CH₂
B) C₆H₅CH=CH₂
C) NH₂-(CH₂)₆-NH₂
D) CH₂=CH-CONH₂
Q8. Which polymer is used in making water bottles?
A) Polyvinyl chloride
B) Polyethylene terephthalate (PET)
C) Nylon
D) Bakelite
Q9. Thermosetting plastics are:
A) Recyclable
B) Non-recyclable
C) Remoldable
D) Soft
Q10. Condensation polymerization involves:
A) Breaking double bonds
B) Releasing small molecules like water
C) Forming only natural polymers
D) Addition of monomers
✅ Answer Key Table
| Q.No | Answer |
|---|---|
| Q1 | A |
| Q2 | B |
| Q3 | A |
| Q4 | B |
| Q5 | B |
| Q6 | B |
| Q7 | B |
| Q8 | B |
| Q9 | B |
| Q10 | B |
🧠 Explanations of All Answers
- Q1 → A: Polymers are made by joining repeating monomer units.
- Q2 → B: Nylon 6,6 forms by condensation reaction, releasing water.
- Q3 → A: Polyethylene is an addition polymer formed from ethylene monomers.
- Q4 → B: Bakelite is a thermosetting plastic.
- Q5 → B: Thermoplastics like PVC and polythene can be remelted.
- Q6 → B: Cellulose is a natural polymer found in plants.
- Q7 → B: Styrene (C₆H₅CH=CH₂) is the monomer of polystyrene.
- Q8 → B: PET is widely used in making water bottles.
- Q9 → B: Thermosetting plastics are hard and non-recyclable.
- Q10 → B: Condensation polymerization releases small molecules like water.
🎯 Why This Practice Matters for ECET 2026
Polymers and plastics are high-yield topics in Chemistry for ECET 2026. Clear understanding of types, monomers, and applications allows you to answer direct MCQs confidently. Practicing with notes and explanations saves time during the exam and helps secure easy marks in the general science section.
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