Corrosion of iron is an electrochemical process that requires:
A. An electrolyte, oxygen, and water
B. Only CO₂
C. Only high temperature
D. Only nitrogen
Answer: Option A
Solution (By JKExamLibrary)
Rusting involves anodic oxidation of iron (Fe → Fe²⁺ + 2e⁻) and cathodic reduction of oxygen (O₂ + 2H₂O + 4e⁻ → 4OH⁻) in the presence of water acting as electrolyte. CO₂ can form carbonic acid accelerating it, but not required. Nitrogen is inert. High temperature alone doesn't cause rusting without moisture and oxygen.
Explanation:
C₂H₄ (ethene) is an alkene with a carbon-carbon double bond, thus unsaturated. The general formula CnH₂n indicates an alkene or cycloalkane. C₃H₈, C₄H₁₀, C₅H₁₂ follow CnH₂n+2 and are saturated alkanes. Unsaturated compounds undergo addition reactions, whereas saturated undergo substitution.
Explanation:
Haematite (Fe₂O₃) is a major ore of iron. Bauxite is aluminium ore, galena is lead sulfide, cinnabar is mercury sulfide. Magnetite (Fe₃O₄) is another iron ore.
Explanation:
James Chadwick discovered the neutron in 1932. He bombarded beryllium with alpha particles and observed a highly penetrating, neutral radiation, which he identified as neutrons. This discovery explained isotopes and completed the basic picture of the atom's subatomic particles.
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