In the reaction Fe₂O₃ + 2Al → Al₂O₃ + 2Fe, which element is oxidized? MCQ with Answer and Explanation

Explanation:
The Montreal Protocol is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances responsible for ozone depletion, most notably chlorofluorocarbons (CFCs). Both statements are correct, and R perfectly explains the purpose of the protocol.

Explanation:
Bakelite is a thermosetting plastic (phenol-formaldehyde resin). Once set, it cannot be remolded by heating because its polymer chains are cross-linked. Polyethylene, PVC, and nylon are thermoplastics—they can be repeatedly softened by heat and hardened on cooling. Thermosetting plastics are used for electrical switches, handles, and adhesives. Vulcanized rubber is also thermoset.

Explanation:
Finely divided nickel catalyzes the addition of hydrogen to liquid oils to form solid fats (vanaspati ghee). Platinum/palladium also work but are expensive. Iron is used in Haber process; V₂O₅ in Contact process.