Corrosion of iron is an electrochemical process that requires:
A. Only CO₂
B. An electrolyte, oxygen, and water
C. Only high temperature
D. Only nitrogen
Answer: Option B
Solution (By JKSSB Mock Tests)
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:
Half-life is a characteristic of first-order kinetics, and all radioactive decay follows first-order kinetics. Hence it applies to all radioactive decay processes. Chemical reactions of first order also have constant half-life independent of initial concentration, but radioactive decay is the prime example. Zero-order half-life depends on initial concentration.
Explanation:
From Faraday's first law, m = ZQ, so Z = m/Q. SI unit is kg/C, but practical unit is g/C. It is the mass of substance liberated per unit charge.
Explanation:
Broad-spectrum antibiotics are effective against a wide range of bacteria, including both Gram-positive and Gram-negative species. Chloramphenicol is a classic example of a broad-spectrum antibiotic. Penicillin is generally narrow-spectrum, primarily targeting Gram-positive bacteria.
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