【Test Your Knowledge】Basic Chemical Engineering Knowledge (220) (Basic Chemistry 6) Please hide your replies

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This post was last edited by zhangyong6404 on 2009-10-25 at 21:39. In accordance with the forum’s uniform requirements, the maximum score for this activity is 15 Wealth points; giving scores based on charm is prohibited. At the same time, friend requests and duplicate ratings are declined. To encourage active participation from members, full marks are given for all correct answers, while 10–12 wealth points are deducted for each incorrect answer. 2 mistakes result in 8–10 wealth points; the rest receive encouragement points of 4–6 wealth points for their participation. 51. The method for producing hydrogen chloride in the laboratory is ( ). A. Reaction of sodium chloride solution with concentrated sulfuric acid when heated B. Reaction of sodium chloride solution with dilute sulfurous acid when heated C. Reaction of sodium chloride crystals with concentrated sulfuric acid when heated D. Reaction of sodium chloride crystals with dilute sulfuric acid when heated. 52. The metal that is least soluble in cold concentrated nitric acid is ( ). A Cu B Ag C Al D Zn 53. A colorless salt solution; upon addition of silver nitrate solution, a white precipitate is formed. Calcium hydroxide is then added and the mixture is heated. Gases with an irritating odor are released. This salt may be ( ). A Sodium chloride B Ammonium chloride C Zinc acetate D Mercury nitrate 54. The reagent required to produce dry ammonia is ( ). A Ammonium chloride, slaked lime, concentrated sulfuric acid B Ammonium chloride, quicklime, phosphorus pentoxide C Ammonium chloride, slaked lime, soda lime D Sulfuric acid plating, slaked lime 55. At the mouth of the bottle containing caustic soda solution, there is often a white solid substance; what is its composition? ( ) A Sodium oxide B Sodium hydroxide C Sodium carbonate D Sodium peroxide 56. Which of the following substances can be stored in an aluminum container? ( ) A Dilute sulfuric acid B Dilute nitric acid C Cold concentrated sulfuric acid D Cold concentrated hydrochloric acid 57. The carbon content in steel is ( ). A Less than 0.2% B Greater than 1.7% C Between 0.2% and 1.7% D Any value. 58. To accurately measure 25.00 ml of dilute hydrochloric acid, which instrument can be used? ( ) A 25ml pipette, R 25ml volumetric flask; 25ml acid burette, D 25ml base burette. 59. The correct procedure for titration using a base burette is ( ). A: Hold it with the left hand near a position slightly below the glass bead. B: Hold it with the left hand near a position slightly above the glass bead. C: Hold it with the right hand near a position slightly below the glass bead. D: Hold it with the right hand near a position slightly above the glass bead. 60. When discussing real gases, if the compressibility factor z > 1, it indicates that the gas ( ). A It is easy to liquefy. B At the same temperature and pressure, its internal pressure is zero. C At the same temperature and pressure, its molar volume is greater than that of an ideal gas. D This gas has a high specific pressure. Answer key: CCBCC CCABC. No scoring will be given in principle if not hidden. Thank you all! To hide the method, click here: Hide Method. Answers using the same IP are valid only for the first post. Also, be careful when posting – edits are invalid! To encourage independent thinking, those who answer all questions correctly are invited to go to the dedicated reward post on [Test Your Knowledge] to claim their prizes (click the link)!