JEE Main Chemistry question
Not in JEE Main or NEET syllabus
Each question contains ASSERTION (Assertion) and REASON (Reason). Each question has the 4 choices (a), (b), (c) and (d), out of which ONLY ONE is correct.
Statement 1 (Assertion): Thermoplastics become soft on heating and hard on cooling. Statement 2 (Reason): Thermoplastics are linear polymers and the polymeric chains are held together by weak intermolecular forces.
Answer: (A)
Solution
Thermoplastics are linear (or slightly branched) polymers whose chains are held together only by weak intermolecular forces (van der Waals/dipole interactions); heating overcomes these weak forces so the polymer softens and
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