Which of the following is a polymer of vinyl chloride?
A. Polythene
B. Teflon
C. Nylon
D. PVC
Answer: Option D
Solution (By JKExamLibrary)
PVC (polyvinyl chloride) is an addition polymer of vinyl chloride monomer (CH₂=CHCl). It is used for pipes, cables, flooring, and medical equipment. Teflon from tetrafluoroethene, polythene from ethylene, nylon is a polyamide (condensation polymer). PVC can be rigid or flexible depending on plasticizers added. It is a thermoplastic. Disposal of PVC by burning produces toxic HCl gas.
Explanation:
Light catalyzes decomposition of H₂O₂. Dark bottles (amber) block light, stabilizing it. Often a stabilizer like urea or phosphoric acid is added. Metal containers may catalyze decomposition.
Explanation:
Amphoteric oxides react with both acids and bases to form salts and water. Aluminum oxide (Al₂O₃) and Zinc oxide (ZnO) are classic examples. Na₂O and MgO are basic oxides that react only with acids, while SO₂ is an acidic oxide that reacts only with bases.
Explanation:
Dmitri Mendeleev formulated the Periodic Law based on atomic masses and left gaps for undiscovered elements. Moseley later modified it to atomic number. Newlands gave Law of Octaves. Lavoisier classified elements into metals and non-metals.
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