The Contact process is used for the industrial manufacture of sulfuric acid. The key step is the oxidation of sulfur dioxide (SO2) to sulfur trioxide (SO3). This reaction is catalyzed by Vanadium pentoxide (V2O5). Platinum was historically used but was replaced by V2O5 because it is cheaper and less susceptible to poisoning.
Explanation:
Reacting with metals (e.g., Zn + 2HCl → ZnCl₂ + H₂) to produce hydrogen gas is a chemical property because new substances are formed. Sour taste is physical sensation, color change of litmus is an indicator of chemical reaction but is not itself a chemical property; reactivity is. Conductivity is physical. Chemical properties describe a substance's ability to undergo chemical change.
Explanation:
Leaching is a chemical method of concentration where the powdered ore is treated with a suitable reagent that dissolves the ore but not the impurities. Calcination and roasting are thermal processes, and smelting involves reduction with a chemical reducing agent like carbon at high temperatures.
Explanation:
Chlorine produced in the chlor-alkali process is used to manufacture PVC (polyvinyl chloride), bleaching powder, disinfectants, and solvents. Glass uses Na₂CO₃. Fertilizers use NH₃ and acids. Steel making uses oxygen. Chlorine is a versatile industrial chemical with many downstream products.
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