Which of the following polymers is used as a non-stick coating in cookware?
A. PVC
B. Teflon
C. Polystyrene
D. Nylon
Answer: Option B
Solution (By JKSSB Mock Tests)
Teflon is polytetrafluoroethylene (PTFE), a fluorocarbon polymer with extremely low coefficient of friction and high thermal stability, making it ideal for non-stick cookware. PVC (polyvinyl chloride) is used in pipes and cables. Polystyrene is used in packaging and insulation. Nylon is a polyamide used in textiles. Teflon is chemically inert and resistant to acids and bases.
Explanation:
Ethanol (C₂H₅OH) is the intoxicating ingredient in beer, wine, spirits. Methanol is toxic. Propanol and butanol are used as solvents, not beverages.
Explanation:
Teflon (Polytetrafluoroethylene or PTFE) is used as a non-stick coating for cookware because of its extreme chemical inertness, high heat resistance, and low friction coefficient. Polythene and PVC melt at lower temperatures, and Bakelite is a thermosetting plastic used for electrical switches.
Explanation:
Aldehydes are organic compounds containing the formyl group, -CHO, where a carbon atom is double-bonded to an oxygen atom and single-bonded to a hydrogen atom. -OH is the hydroxyl group (alcohols), -COOH is the carboxyl group (carboxylic acids), and -CO- is the carbonyl group (ketones).
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