Catalytic converters in automobiles use which metals to reduce pollution?
A. Gold, Silver, Copper
B. Iron, Copper, Nickel
C. Platinum, Palladium, Rhodium
D. Zinc, Lead, Tin
Answer: Option C
Solution (By JKExamLibrary)
Catalytic converters use precious metals like platinum, palladium, and rhodium as catalysts to convert toxic exhaust gases (CO, NOx, unburnt hydrocarbons) into less harmful substances (CO₂, N₂, H₂O) before they are released into the atmosphere. These metals are chosen for their high catalytic activity and durability.
Explanation:
Single superphosphate (SSP) is a phosphorus fertilizer, a mixture of monocalcium phosphate and gypsum, produced by treating rock phosphate with sulfuric acid: Ca₃(PO₄)₂ + 2H₂SO₄ → Ca(H₂PO₄)₂ + 2CaSO₄. Urea and ammonium nitrate are nitrogenous fertilizers. Potassium chloride is a potash fertilizer. Phosphorus promotes root development and flowering.
Explanation:
The atomic number (Z) equals the number of protons, which is 17. The mass number (A) is the sum of protons and neutrons. Therefore, the number of neutrons = A - Z = 35 - 17 = 18. This atom is Chlorine-35, a stable isotope of chlorine.
Explanation:
Diamond has a rigid 3D covalent network, making it the hardest natural material. It does not conduct electricity (no free electrons). It is not layered (graphite is). It is used as an abrasive, not a lubricant.
No comments yet. Be the first to start the discussion!