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Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.
Reason (R): Linear polymers are thermo-setting.
Reason (R): Linear polymers are thermo-setting.
- a)Both A and R are individually true and R is the correct explanation of A
- b)Both A and R are individually true but R is not the correct explanation of A
- c)A is true but R is false
- d)A is false but R is true
Correct answer is option 'C'. Can you explain this answer?
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Assertion (A): Linear polymers are rigid at low temperatures but soft ...
Ans. (c) A is true but R is false
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Assertion (A): Linear polymers are rigid at low temperatures but soft ...
Linear Polymers - Assertion and Reasoning
Assertion (A): Linear polymers are rigid at low temperatures but soft and mouldable at elevated temperatures.
Reason (R): Linear polymers are thermo-setting.
Explanation:
• Linear polymers are made up of long chains of repeating units called monomers.
• Linear polymers are flexible and rubbery at room temperature.
• When the temperature is increased, the kinetic energy of the polymer chains increases, and they start to move more freely and become soft and mouldable.
• At low temperatures, the polymer chains are held together by strong intermolecular forces, making the material rigid.
• Linear polymers are not thermo-setting, as they do not undergo irreversible chemical changes when heated.
• Thermo-setting polymers are those that undergo irreversible chemical changes when heated and become hard and rigid.
• Examples of thermo-setting polymers are Bakelite, melamine, and epoxy resins.
• Therefore, the assertion (A) is true, but the reason (R) is false.
• Hence, option (C) is the correct answer.
Conclusion:
• Linear polymers are flexible and rubbery at room temperature.
• They become soft and mouldable at elevated temperatures due to increased kinetic energy of the polymer chains.
• Linear polymers are not thermo-setting as they do not undergo irreversible chemical changes when heated.
Assertion (A): Linear polymers are rigid at low temperatures but soft and mouldable at elevated temperatures.
Reason (R): Linear polymers are thermo-setting.
Explanation:
• Linear polymers are made up of long chains of repeating units called monomers.
• Linear polymers are flexible and rubbery at room temperature.
• When the temperature is increased, the kinetic energy of the polymer chains increases, and they start to move more freely and become soft and mouldable.
• At low temperatures, the polymer chains are held together by strong intermolecular forces, making the material rigid.
• Linear polymers are not thermo-setting, as they do not undergo irreversible chemical changes when heated.
• Thermo-setting polymers are those that undergo irreversible chemical changes when heated and become hard and rigid.
• Examples of thermo-setting polymers are Bakelite, melamine, and epoxy resins.
• Therefore, the assertion (A) is true, but the reason (R) is false.
• Hence, option (C) is the correct answer.
Conclusion:
• Linear polymers are flexible and rubbery at room temperature.
• They become soft and mouldable at elevated temperatures due to increased kinetic energy of the polymer chains.
• Linear polymers are not thermo-setting as they do not undergo irreversible chemical changes when heated.
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Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? for Mechanical Engineering 2025 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer?.
Solutions for Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for Mechanical Engineering.
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ample number of questions to practice Assertion (A): Linear polymers are rigid at low temperatures but soft andmouldable at elevated temperatures.Reason (R): Linear polymers are thermo-setting.a)Both A and R are individually true and R is the correct explanation of Ab)Both A and R are individually true but R is not the correct explanation of Ac)A is true but R is falsed)A is false but R is trueCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Mechanical Engineering tests.
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