ACSBR 6 Identification of Ions and Gases - Assignment

Anglo-Chinese School (Barker Road) A Methodist Institution Founded in 1886 CHEMISTRY DEPARTMENT OF SCIENCE Name: ( ) Class: SEC 3 IDENTIFICATION OF IONS & GASES – ASSIGNMENT ALEX LEE/2010 PAGE 1 OF 5 PURE/COMBINED Multiple-Choice Questions [20 Marks] TOTAL SCORE / 30 Write in your selected answer for the multiple-choice questions in the boxes provided. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 1. Which of the following gases is not colourless? A ammonia B chlorine C hydrogen D sulfur dioxide 2. Which of the following gases has the highest pH when dissolved in water? A ammonia B chlorine C hydrogen D sulfur dioxide 3. A mixture of gases was examined using the apparatus as shown. At the end of the experiment, it was found that the copper(II) sulfate was white, the acidified potassium dichromate(VI) was green and the limewater contained a white precipitate. Which of the following gases must be present? A carbon dioxide and chlorine B carbon dioxide and sulfur dioxide C carbon dioxide, sulfur dioxide and water vapour D chlorine and sulfur dioxide gas sample anhydrous CuSO4 acidified K2Cr2O7 limewater

ALEX LEE/2010 PAGE 2 OF 5 4. An unknown solid, X, was added to an excess of dilute sulfuric acid. Effervescence is observed, and a colourless, odourless gas is evolved. When tested with a lighted splint, the splint is extinguished with a ‘pop’ sound. The solid dissolves completely to form a colourless solution. Which of the following could be X? A Ca (s) B CaCO3 (s) C Mg (s) D MgCO3 (s) 5. A student has a sample of gaseous sulfur dioxide. He tests it by shaking the gas with a sample of aqueous potassium dichromate(IV) mixed with aqueous sodium hydroxide. He expects the solution to change from orange to green. What error did he make? A Aqueous potassium permanganate should be used in place of potassium dichromate(VI). B Dilute sulfuric acid should be used in place of aqueous sodium hydroxide. C The colour change should be from green to orange instead. D The gas should be bubbled through the solution instead. 6. When carbon dioxide is bubbled through aqueous limewater, a white precipitate is formed. Which of the following statements about this chemical reaction is true? A Aqueous limewater is aqueous calcium chloride. B Aqueous limewater must be acidified before use. C The white precipitate dissolves in an excess of carbon dioxide. D The white precipitate formed is calcium oxide. 7. Gaseous samples of carbon dioxide and chlorine were separately bubbled through litmus solution. Which of the following accurately describes the appearance of the solution after a long time? carbon dioxide bubbled through litmus solution chlorine bubbled through litmus solution A B C D blue blue red red colourless red colourless red 8. A solid sample of salt Y is added to an excess of distilled water. A colourless solutio