Which of the following is a secondary air pollutant?
A. Ozone
B. SO₂
C. CO
D. Lead
Answer: Option A
Solution (By JKExamLibrary)
Tropospheric ozone is not emitted directly; it forms by photochemical reactions of NOx and VOCs in sunlight. So it's a secondary pollutant. CO, SO₂, and lead are primary pollutants emitted directly from sources. Secondary pollutants include ozone, PAN (peroxyacetyl nitrate), and sulfuric acid mist. Ozone at ground level is harmful.
Explanation:
The unwanted earthy or sandy impurities present in an ore are called gangue (or matrix). Flux is added during smelting to react with these impurities, and the resulting fused mass is called slag, which is lighter and floats on top of the molten metal for easy removal.
Explanation:
Galvanization coats iron with zinc. Zinc is more reactive, corrodes first (sacrificial protection). Tin coating protects only if intact. Chromium is used for plating, nickel for alloys, but galvanizing specifically uses zinc.
Explanation:
Artificial transmutation is the conversion of a chemical element or an isotope into another through a nuclear reaction induced by bombarding it with high-energy particles (like alpha particles, protons, or neutrons). This was first achieved by Rutherford in 1919 when he converted nitrogen into oxygen.
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