Analytical Chemistry Past Paper PDF 2019

ANALYTICAL CHEMISTRY SET A INSTRUCTION: Select the correct answer for each of the following questions. Mark ONLY ONE ANSWER for each item by shading the box corresponding to the letter of your choice on the answer sheet provided, STRICTLY NO ERASURES ALLOWED. MULTIPLE CHOICE 1. What do you call a co...

ANALYTICAL CHEMISTRY SET A INSTRUCTION: Select the correct answer for each of the following questions. Mark ONLY ONE ANSWER for each item by shading the box corresponding to the letter of your choice on the answer sheet provided, STRICTLY NO ERASURES ALLOWED. MULTIPLE CHOICE 1. What do you call a combination of two or more materials which retain their individual properties and can be separated by physical means. A. solvents C. mixtures B. reactions D. solutions 2. A polar solute usually dissolves in a polar solvent and a nonpolar solute usually dissolves in a nonpolar solvent. This Is A Hund's rule C. the solubility rule B. Henrys law D. the "Iike dissolves like' rule 3. What is the molarity of a solution containing 72.9 grams of HCI in enough water to make 500 mL of solution? A. 2.0 m/L C. 5.0 m/L B. 4.05 g/L D. 4.05 m/L 4. A solution has 3x10-4 copper 2+ content. How much is the copper 2+ content in ppm? A. 3 ppm C. 9 ppm B. 38 ppm D. 19 ppm 5. Solutions of electrolytes and metals are _____ A. Insulators C. Negative B. Polar D. Conductors 6. The recommended procedure for preparing a very dilute solution Is not to weigh out a very small mass or measuring a very small volume of a solution. Instead it IS done by e series of dilutions. A sample of 0.8214 g of KMnO4 (158.04) was dissolved in water and made up to the volume in a 500- ml volumetric flask. A 2.000-rnl sample of this solution was transferred to a 1000-ml volumetric flask and diluted to the with water. Next. 10.00 ml of the diluted solution were transferred to a 250-ml flask and diluted to the mark with water. What is the concentration (in molarity) of the final solution? A. 0.1039 M C. 8.316 x 10-7 M B. 2.079 x10-5 M D. None of these 7. How much of a 2.0M stock solution do you need to prepare 50 ml of a 1.0 M solution? A. 75 ml C. 25 ml B. 30 ml D. 50 ml 8. A statement that sums up what you learned from an experiment and states if the hypothesis Is proven or disproven is called A. procedure C. hypothesis B. control group D. conclusion 9. A prediction or a possible explanation to the question or problem which can be tested in an experiment is called A. hypothesis C. graph B. procedure D. data 10. The number 2.34x10-7 is the scientific notation for _______ A. 234000 C. 23400000 B. 23400 D. 2340000 11. Express the number 0.051065 to four significant figures A. 0.051 C. 0.05106 B. 0.051 D. 0.0511 12. The volume of a liquid is 20.5 mL. Which of the following sets of measurement represents the value with good accuracy? A. 19.2 mL, 19.3 mL, 18.8 mL, 18.6 mL C. 18.6 mL, 17.8 mL, 19.6 mL, 17.2 mL B. 18.9 mL, 19.0 mL, 19.2 mL, 18.8 mL D. 20.2 mL, 20.5 mL, 20.3 mL, 20.1 mL 13. What is the chemical formula of diphosphorus monobromide? A. PBr2 C. P2Br2 B. PBr D. P2Br 14. Which of the following Is a chemical reaction? A. an air conditioner cooling the air C. bleaching your clothes B. none of these choices D. melting of ice 15. Noble gases are inert because they have completed outer electron shells. Which of these elements isn’t a noble gas? A. Chlorine C. Helium B. Krypton D. Argon 16. What is the most common Isotope of hydrogen? A. Hydrogen only has one isotope C. Tritum B. Deuterium D. Protium 17. As you move from top to bottom down the periodic table A. change in atomic radius cannot be predicted C. electronegativity decreases B. ionization energy increases D. atomic radius decreases 18. What do you call an atom that has more protons than electrons? A. an anion C. a molecule B. none of the choices D. an isotope 19. Which one of the following is a chemical equation? A. CO2 C. Ice + heat → water B. C + O2 → CO2 D. iron + oxygen → rust 20. As you move from left to right across the periodic table A. atomic radius increases C. electronegativity decreases B. Ionization energy decreases D. atomic radius decreases 21. Balance the following equation: Ag + O2 → Ag2O A. Put a 2 in front of Ag C. Add a subscript 2 to the end of Ag2O B. Add a 4 in front of Ag and a 2 in front of Ag2O D. Add a 2 in front of Ag and a 1 in front of Ag2O 22. Which is NOT an acceptable name for Hg2Cl2? A. mercury (Il) chloride C. mercurous chloride B. mercury (I) chloride D. dimercury dichloride 23. Under the Lewis concept of acid and bases, an acid is A. An electron pair donor C. a proton donor B. a proton acceptor D. an electron pair acceptor 24. Which of the following is NOT an acid? A. milk of magnesia C. milk B. apple juice D. gastric Juice 25. Which of the following is NOT an acid-base conjugate pair? A. NH3 and NH4+ C. H2O and OH- B. H2S and OH- D. HCN and CN- 26. When NH4Cl hydrolyzes, the resulting solution is _______ A. acidic C. neutral B. basic D. none of the choices 27. Aqua regia, the reagent that can be used to dissolve gold, lg a 3:1 mixture of which acids? A. hydrochloric and nitric acids C. hydrochloric and sulfuric acids B. hydrofluoric and nitric acids D. perchloric and sulfuric acids 28. Which Of the following conjugate acid/base pairs should be used to prepare a buffer with pH near 7.15? A. Formic acid I sodium formate (pKa — 3.74) B. Sodium dihydrogen phosphate/ sodium hydrogen phosphate (pKa2 = 7.20) C. Succinic acid/sodium succinate (pKa = 5.64) D. Glycylglycine I sodium glycylglycate (pKa = 8.35) 29. Predict the products of the following acid-base reaction: NH3(aq)+ HNO3(aq) A. no reaction takes place C. NH2OH(aq) + HNO2(aq) B. NH4OH(aq) D. NH4NO3(aq) 30. What is the gas which behaves the most like an ideal gas? A. oxygen C. helium B. nitrogen D. hydrogen 31. What happens to the volume of a fully inflated balloon when it is taken outside on a cold day? A. its volume decreases C. it remains the same B. its volume increases D. its volume becomes equal to zero 32. The standard pressure of the atmosphere at sea level is A. 760 mm Hg B. all of the choices C. 760 torr D. 1 atm 33. Each of these flasks contains the same number of molecules. In which container is the pressure highest? A. Flask 2 B. Flask 1 C. Flask 3 D. Flask 4 34. What Is the molar mass or an unknown gas if 1.60 grams of that gas occupies a volume of 2.24 L at STP? A. 35.8 g/mol C. 16.0 g/mol B. 160 g/mol D. 81.0 g/mol 35. When chromium changes from an oxidation state of +3 to that of +6, the Cr3+ must: A. gain 6 electrons C. lose 3 electrons B. lose 6 electrons D. gain 3 electrons 36. During the electroplating of silver. silver ions in solution ________ A. are oxidized al the anode C. are reduced at the cathode B. are oxidized at the cathode D. remain in solution unchanged 37. The equation that represents a reaction that is NOT a redox reaction is: Reaction 1: 2 H2 + O2 → 2 H2O Reaction 2: Zn + CuSO4 → ZnSO4 + Cu Reaction 3: 2 H2O2 → 2H2O + O2 Reaction 4: H2O + CO2 → H2CO3 A. Reaction 3 C. Reaction 4 B. Reaction 1 D. Reaction 2 38. In an electrolytic cell oxidation occurs A. at the anode C: at either the cathode or the anode B. between the cathode and the anode D. at the cathode 39, For this reaction Mg + H2O → MgO + H2 which is FALSE A. H is the oxidizing agent C. Mg is the oxidizing agent B. Mg lost electrons D. H gained electrons 40. Which procedure is recommended for reading the level of an aqueous solution in a buret or graduated cylinder? A. Keep the eye level with the top of the meniscus and record that reading B. Read both the bottom and top of the meniscus and average those readings C. Keep the eye level with the bottom of the meniscus and record that reading D. Look down at the meniscus at an angle to obtain the average reading directly 41. What Is the main ISO Standard used by testing and calibration laboratories to gain accreditation and formal of their competence to carry out tests and/or calibrations, including sampling? A. ISO/IEC 17025 C. AOAC B. EURACHEM D. ISO 9000:2000 42. This detects contamination from reagents, sample handling and the entire measurement process. A. matched-matrix blank C. solvent blank B. method blank D. calibration blank 43. There is a definite correlation between orderliness and level of safety in the laboratory. In addition, a disorderly laboratory can hinder or endanger emergency response personnel. Which or the following housekeeping rules should NOT be adhered to? A. never obstruct access to exits and emergency equipment B. properly label and store all chemicals C. store chemical containers on the floor D. clean work areas, including floors, regularly 44. In order to ensure an accurate weighing when using the balances, one should ______ A. leave the object on the balance for several minutes to ensure a stable reading B. not lean on the balance bench, close the draft doors on the balance and zero the balance prior to weighing C. turn the balance off to clear any previous weighing from its memory D. weigh the object several times on different balances and take the average of these weighing 45. Which of the following is NOT part of the technique for pouring in a laboratory? A. Connect the pouring spout and receiving container using a stirring rod B. Pour fast enough to avoid spills C. pour and allow the liquid to ran along the stirring rod D. Hold containers at arm’s length with elbows slightly bent 46. The method that is widely used for the determination of the protein content of meat and animal food is the A. Kjeldahl method C. McBride method B. Mohr method D. Liebig meth0d 47. The water content of an 875.4-mg sample of cheese was determined with a moisture analyzer. What is the %w/w H2O in the cheese if the final mass was found to be 545.8 mg? A. 35.23% B. 30.6% C. 31.45% D. 37.65% 48. An analytical chemist needs to transfer his/her precipitant from the beaker to the filter paper. Which of the following would be the best procedure to adopt in order to ensure a quantitative transfer of the predicate? A. none of the choices. B. Most of the liquid above the ppt is decanted then bulk of ppt Is transferred to filter paper through a stirring rod, the beaker is washed with big volumes of wash solution. C. Most of the liquid above the ppt is decanted first, bulk of the ppt is transferred through a stirring rod and, wash the beaker several times with small volumes of wash solution. D. Solution is shaken, then immediately filtered; beaker Is washed with relatively big volumes of wash solution. 49. A water sample Is collected for analysis of Oil and grease. The analysis will not be done immediately. The sample should NOT be A. collected in plastic bottle C. refrigerated til analyzed B. preserved with sulfuric acid D. collected in all glass bottle 50. When two materials that have different densities, like oil and water encounter one another, they will _____. A. separate according to their densities C. mix uniformly B. exchange densities D. repel one another 51. Conductivity is defined as A. The ability of a substance to conduct electric current, which is the same as resistivity B. The ability of a substance to repel electric current C. The ability of a substance to conduct variable resistance D. The ability of a substance to conduct electric current, which Is the reciprocal of resistivity 52. Even though all solid states of other materials are denser than the liquid states of materials, what unique property of water? A. It is clear B. It Is tasteless C. Solid water (ice) is less dense than liquid water (ice floats in water) D. It can freeze 53.The following statements are true about electrical conductivity EXCEPT A. a measure of a solutions capacity to conduct electricity B. a measure of the total dissolved solids in a solution C. increasing temperature has no effect on its value D. is directly affected by temperature 54. The following statements are true about pH EXCEPT A. The negative logarithm of hydrogen ions content in a solution B. a measure of the acidity or alkalinity of a solution C. a measure of the amount or hydrogen ions in solution D. does not change when there are changes in temperature 55. In maintenance and storage of pH meters. which of the following procedure shall NOT be done? A. Mild soap solution may be used in general cleaning of the electrodes B. To keep the electrode bulb moist during storage, store the electrode in distilled water. C. Blot electrode dry after rinsing the pH electrodes. D. Rinse pH electrodes in between measurements. 56. The apparatus shown below would be used to A. distill a liquid. C. filter a precipitate. B. chromatograph a mixture. D. reflux a solution. 57. In operating a UV-Vis spectrophotometer, the following shall be done. EXCEPT for A. Before turning on the power, check if the sample holder does not contain anything. B. After turning on, allow the spectrophotometer to initialize and stabilize according to its user manual. C. If there are any spillage that gets onto the instrument, immediately wipe it away. D. Keep the sample compartment open during measurement. 58. In using fume hoods. the following shall be done, EXCEPT for A. Items contaminated with odorous or hazardous materials should be removed from the hood only after decontamination or if placed in a closed outer container to avoid releasing contaminants into the laboratory air. B. The hood be kept closed except during apparatus set-up or when working within the hood C. The hood may be used as e permanent storage area for volatile chemicals when an appropriate storage cabinet is not available. D. Ensure the exhaust operating before using the hood. 59. In purifying a material by crystallization choose the solvent according to the following EXCEPT A. solubility C. reactivity B. vapor pressure D. polarity 60. The dynamic range in analytical measurement refers to the range where A. the instrument reading is constant B. the detection limit lies C. the sensitivity of the instrument is highest D. the instrument reading is linearly related to the input value 61. What is the law that states the linear relationship between absorbance and concentration of an absorbing species? A. Boyles Law C. Charles Law B. Beer-Lambert's Law D. Avogadro’s Law 62. Determine the actual volume contained in a 50.0 mL volumetric flask given the following data: Mass of water: 50.1227 g, Density of water at 25 C: 0.99707 g/mL A. 50.27 mL B. 50.37 ml C. 50.17 mL D. 50.45 mL 63. A lab analyst dissolved 4.021 g of NaOH in water and made up the solution to 1 litre with water. He then pipetted 10.00 mL of this solution into a flask and titrated it with 0.050 M HCI solution from a burette. A volume of 20.32 mL of acid had been used at the endpoint. Examining this result, the lab supervisor could deduce that _____ A. the NaOH absorbed H2O from the air after its mass was measured B. the burette was rinsed with water instead of HCI C. the analysis is as accurate as can be expected using this apparatus D. the pipette was rinsed with water instead of NaOH 64. In which of the following titrations does pH = 7.0 occur at the equivalence point? I. Strong acid/strong base ll. Weak acid/strong base Ill. Strong acid/Weak base A. Il and Ill only C. I only B. Ill only D. Il only 65. The following are good sampling practices EXCEPT A. Collect the sample in a container made of material that will chemically react with the sample. B. Sample frequently enough to allow for the Identification Of process cycles. C. Take several increments and composite them to tom the sample. D. If possible, mix the material before getting the sample. 66. In liquid-liquid extraction, It is often necessary to determine which liquid is aqueous and which liquid is nonaqueous. To test the liquids, add a drop of water to the top layer. If the drop dissolves in the top layer, the top layer is ______ A. aqueous B. denser C. miscible D. nonaqueous 67. The process in which the sample is heated to the boiling point of the solvent and volatile analytes are concentrated in the vapor phase, condensed and collected. A. distillation C. evaporation B. liquid-liquid extraction D. oven drying 68. Glass container is NOT suitable for A. oil and grease determination C. all of the choices B. microbiological analyses D. inorganic trace analyses 69. The maximum holding time for acid preserved samples that will be subjected to determination of metals is A 48 hours C. 6 months B. 3 months D. 1 week 70. The substance which does the dissolving and must be greater than 50% of the solution is called A. solute C. mixture B. solvent D. solution 71. Quantitative chemical analysis of weighing a sample, usually of a separated and dried precipitate is called A. Gravimetric analysis C. Volumetric analysis B. Elemental analysis D. Titrimetric analysis 72. Which of the following is a primary standard for use in Standardizing bases? A. Acetic acid C. Potassium hydrogen phthalate B. Sulfuric acid D. Ammonium hydroxide 73. How many grams of Sodium Persulfate (Na7S2O8) are required to prepare a 1 L solution of Sodium Persulfate With concentration of 10% (w/v). This solution is widely used as oxidizing reagent for Total Organic Carbon analyzer (TOC). A. 100 g of Sodium Persulfate C. 102 g Of Sodium Persulfate B. 101 g of Sodium Persulfate D. 99 g Of Sodium Persulfate 74 How many grams of sodium hydroxide is needed to prepare 500 mL of 0.5 N sodium hydroxide? (Sodium=22.99 g/mole. Oxygen: 16.00 g/mole, Hydrogen- 1.008 g/mole) A. 13.8115 g C. 9.9995 g B. 15.7470 g D. 10.2615 g 75. What is the light source used In the visible range to 340-1000 nm? A, nerst blower C. deuterium B. tungsten D. Incandescent 76. Minimum concentration of a substance that can be measured and reported with confidence at the analyte concentration is greater than zero refers to _______ A Lower Warning Limit C. Control Limit B. Method Detection Limit D. Limit of Quantitation 77. Which of the following instruments uses a cuvette? A. Gas Chromatograph C. pH Meter B. U-Vis Spectrophotometer D. Flame-MS 78. The most appropriate technique to determine levels or the Pb2+ ion in blood is A. atomic absorption spectroscopy C. infrared spectroscopy B. mass spectrometry D. high-performance liquid chromatography 79. Analytical methods or instruments' performance aim for A. Low signal-to-noise ratio C. Low dynamic range B. High variability D. High signal-to-noise ratio 80. A graphical representation of measuring signal as a function of quantity of analyte is A. Absorbance Chart C. Quality Control Chart B. Calibration curve D. none of the choices 81. For the reaction, Fe3+(aq) + SCN-(aq) → FeSCN2+(aq) The equilibrium constant for this reaction can best be determined by means of A. Ion-exchange C. Spectrophotometry B. Conductance D. Chromatography 82. A food scientist has a sample of a plant oil and wants to determine if the oil contains saturated or unsaturated fatty adds. Which of the following techniques would most useful for this purpose? A. mass spectroscopy C. infrared spectroscopy B. ultraviolet spectroscopy D. visible spectroscopy 83. What is a graph showing the detectors response as a function of elution: band's shapes, position, resolution? A. monitor display C. quality control chart B. chromatogram D. calibration curve 84. A stable light source in AAS analysis, which is necessary to emit the sharp characteristic spectrum of the element to be determined is called A. Tungsten lamp C. deuterium lamp B. hollow cathode lamp D. Nerst blower 85. It is a hazardous waste characteristics which applies to wastes that have the potential to contaminate groundwater if improperly disposed of. These materials are regulated as hazardous waste due to their potential to leach out specific toxic substances in a landfill. A. Reactivity C. Toxicity B. Corrosivity D. Ignitability 86. In handling acid wastes, what type of protective gloves should be used? A. Rubber gloves C. Disposal plastic gloves B. Cloth gloves D. Surgical gloves 87. According to Revised DAO 04-36. the appropriate waste labels shall Include A. all of the choices C. Volume of Waste B. Generator ID Number D. Container Material 88. The following acids and acid mixtures can be collected and placed in glass containers EXCEPT for A Sulfuric acid C. Aqua regia B. Hydrofluoric acid D. Hydrochloric acid 89. When working with concentrated acids except hydrofluoric acid, which of the following statements are TRUE? l. gloves covering the whole arm or Nitrile gloves should be worn. ll. Half- or full-faced masks with gas- and/or vapor removing respirators should be worn. Ill. Wearing safety boots or foot covering is optional as long as tie person is working under the hood. IV. Wearing of apron is optional as long as laboratory gown is worn. C. all of the choices A. I & II D. I & IV B. II & III 90. The fire triangle consists of which of the following? A. Oxygen, Heat, Material C. Air, Fuel, Spark B. Air, Heat. Fire D. Oxygen. Heat, Fuel 91. In order to property maintain chemical laboratory equipment one should perform the following EXCEPT A. place the equipment in hot humid location C. regular Inspection of operational components B. regular calibration of equipment D. thorough cleaning with the proper materials 92. Which Is TRUE about laboratory hoods? A. all of the choices B. Provides further protection by diluting low of flammable gases below explosion limits. C, It protect you from being exposed in chemical fume. D. Must always be on 93. What is the type of chemical that can cause an allergic reaction in the airways following inhalation of chemical A. Corrosive C. oxidizer B. Respiratory Sensitizer D. Carcinogen 94. Which of the following may be disposed In the Sink? A. 0.1M H2SO4 C. none of the choices B. 1 g/ml PCl4 D. 200 g/ml PCl4 95. Ammonia solution can be stored with the following chemicals EXCEPT for A. cyclohexane solution C. 2-propanol solution B. acetic acid solution D. sodium hydroxide solution 96. Which of the following Can Cause ERRORS during the sample preparation stage? l. Loss of sample during weighing or dissolution Il. Contamination by impurities in reagents and in the environment Ill. Changes in mass due to varying humidity and temperature IV. Obtaining inhomogeneous sample from the bulk A. l and Il only C. l, Il, and Ill B. l, Ill. and IV D. I, II, Ill, and IV 97. What will you perform to know that Atomic absorption spectrometer continues to work property? A. Calibration check B. Blank C. QC sample recoveries D. Standard addition 98. Consider that you are working with Vitamin C table production, to which standard's should your quality management should subscribe? A. GMP C. ISO 9001:2008 B. HACCP D. All of the choices 99. The test that decides whether a datum from a given set could be rejected or NOT IS A. T-test C. Q-test B. Z-test D. F-test 100. Saying that the concentration of Total cyanide (CN-) In drinking water is 0.05 mg/L. which is below the maximum allowable level of 0.07 mg/L as per DOH DAO No. 20070012 when it is actually that limit is above that limit is _____. A. accurate B. false negative C. precise D. false positive