Which of the following is a polymer of vinyl chloride?
A. Polythene
B. PVC
C. Nylon
D. Teflon
Answer: Option B
Solution (By JKSSB Mock Tests)
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:
Lead-acid batteries use dilute H₂SO₄ as electrolyte. The electrodes are Pb and PbO₂. During discharge, both plates form PbSO₄ and the acid concentration decreases. Recharging reverses the reaction.
Explanation:
Yeast (Saccharomyces cerevisiae) enzymes convert glucose to ethanol and CO₂ anaerobically. Bacteria produce lactic acid or acetic acid; algae are photosynthetic.
Explanation:
Ammonia (NH₃) is manufactured by the Haber process, which involves the direct combination of nitrogen and hydrogen gases at high pressure (200 atm) and moderate temperature (450°C) in the presence of an iron catalyst. The Contact process is for sulfuric acid, and Ostwald's is for nitric acid.
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