Analytical Chemistry Complete QuizAnalytical chemistry focuses on identifying, quantifying, and understanding chemical components in substances using advanced techniques. It plays a crucial role in research, industry, and quality control. 1 / 60What is the primary basis of gravimetric analysis Color change of the analyte Electrical conductivity of the solution Measurement of the mass of the analyte Change in temperature 2 / 60Infrared light causes molecules to: A) Rotate B) Ionize C) Vibrate D) Disintegrate 3 / 60Which of the following types of compounds are best analyzed using Gas Chromatography Non-volatile compounds Large proteins Volatile and thermally stable compounds Highly polar, ionic compounds 4 / 60EDTA is a ......dentate ligand because it has how many donor atoms 2 3 5 6 5 / 60The linear relationship in Beer-Lambert’s law holds true only for: A) High concentrations B) Low concentrations C) All concentrations D) Aqueous solutions only 6 / 60Which sample type is NOT suitable for mass spectrometry? a) Gaseous compounds b) Volatile liquids c) Solid metal blocks d) Organic molecules 7 / 60Which of the following compounds would elute first in cation-exchange chromatography? Na+ Ca²⁺ Mg²⁺ K+ 8 / 60Which injection method is used for analyzing thermally unstable compounds in GC? Split injection Splitless injection On-column injection Flash vaporization 9 / 60What is the unit of molar absorptivity (ε) in Beer-Lambert’s law L mol⁻¹ cm⁻¹ cm mol⁻¹ L⁻¹ mol L⁻¹ cm mol⁻¹ L cm⁻¹ 10 / 60What effect do electronegative atoms have on nearby protons in NMR? A) Shielding, moving the signal upfield B) Deshielding, moving the signal downfield C) No effect D) Causes splitting of the signal 11 / 60What is the base peak in a mass spectrum? a) The heaviest ion b) The tallest peak representing the most abundant ion c) The smallest ion d) The peak with the highest m/z ratio 12 / 60What is the typical mobile phase used in ion-exchange chromatography Organic solvents Aqueous buffer solutions Non-polar gases Supercritical fluids 13 / 60Which detector is commonly used in XRD? a) Photomultiplier tube b) Geiger counter c) Scintillation counter d) None 14 / 60In ¹H NMR, the splitting pattern is explained by Spin-spin coupling Chemical shift Signal-to-noise ratio Solvent effects 15 / 60Which of the following solvents would likely move a polar compound faster in paper chromatography Water ethanol hexane acetone 16 / 60Which gas is commonly used as a fuel in Flame AAS? A) Oxygen B) Acetylene C) Helium D) Argon 17 / 60What is the purpose of drying or ignition in gravimetric analysis To dissolve the precipitate To remove moisture and volatile impurities To increase the solubility of the analyte To facilitate filtration 18 / 60In NMR spectroscopy, the nucleus of an atom behaves like a Stationary charge Magnetic dipole Static electric field Neutral particle 19 / 60If a molecule has extensive conjugation, its absorption in the UV-Vis spectrum will shift towards Lower wavelength (blue shift) Higher wavelength (red shift) No significant change UV region only 20 / 60What type of solvent is used in ¹H NMR? A) Water B) Deuterated solvents C) Alcohols D) Acids 21 / 60A typical application of ion-exchange chromatography is Separation of amino acids Separation of volatile organic compounds Identification of fatty acids Thin-film coating 22 / 60Which factor does NOT affect the absorption spectrum in UV-Vis spectroscopy Solvent polarity pH of the solution Molar mass of the compound Temperature 23 / 60The region between 4000–400 cm⁻¹ in an IR spectrum is called the Fingerprint region Functional group region Overtone region UV-Vis region 24 / 60What is the advantage of using TLC over column chromatography? TLC is faster and requires less solvent TLC can handle large sample volumes TLC gives better resolution TLC is more suitable for large-scale purification 25 / 60Which of the following is NOT a common requirement for a precipitate in gravimetric analysis? Low solubility High purity Large crystal size High hygroscopicity 26 / 60Which element's isotopes produce an M+2 peak with a 3:1 intensity ratio? a) Bromine b) Chlorine c) Sulfur d) Oxygen 27 / 60UV-Visible spectroscopy is based on the absorption of radiation in which wavelength range 100–400 nm 200–800 nm 400–700 nm 10–1000 nm 28 / 60IR spectroscopy is best suited for detecting Nuclear spin changes Functional groups Atomic structure Molecular weight 29 / 60Which ionization technique is commonly used in drug testing? a) MALDI b) Gas Chromatography-Mass Spectrometry (GC-MS) c) NMR Spectroscopy d) UV Spectroscopy 30 / 60Why is mass spectrometry useful in forensic science? a) It can detect trace amounts of drugs and explosives b) It determines color composition c) It identifies taste properties d) It measures boiling points 31 / 60Which of the following is NOT a primary standard for acid-base titrations Sodium carbonate (Na₂CO₃) Potassium hydrogen phthalate (KHP) Sodium hydroxide (NaOH) Oxalic acid (H₂C₂O₄) 32 / 60Which of the following is an application of gravimetric analysis? Determination of sulfate as BaSO₄ Identification of organic compounds Spectrophotometric analysis Gas chromatography 33 / 60Which reagent is commonly used in the dry test for sulfates Barium chloride Silver nitrate Potassium permanganate Lead acetate 34 / 60The digestion process in gravimetric analysis helps in Increasing the solubility of the precipitate Decreasing the particle size of the precipitate Coagulating the precipitate for better filtration Preventing precipitation from occurring 35 / 60What is the role of a Hollow Cathode Lamp (HCL) in AAS? A) It absorbs light from the sample B) It emits light specific to the element being analyzed C) It provides thermal energy for atomization D) It detects the intensity of absorbed light 36 / 60Which of the following is NOT a step in gravimetric analysis Precipitation filtration titration drying 37 / 60What type of flame is commonly used in Flame Atomic Absorption Spectroscopy (FAAS)? A) Hydrogen-oxygen flame B) Air-acetylene or nitrous oxide-acetylene flame C) Methane-oxygen flame D) Argon plasma flame 38 / 60The ideal precipitate in gravimetric analysis should Be highly soluble Have a large surface area Form colloidal suspensions Have a well-defined chemical composition 39 / 60Which of the following tests is used to detect the presence of sodium ions in a dry test? Cobalt nitrate test Lassaigne’s test Flame test Borax bead test 40 / 60Which type of vibration does NOT appear in an IR spectrum? Stretching Bending Torsional Rotational 41 / 60The Kjeldahl method uses titration to determine Sodium content Nitrogen content Water hardness Oxygen concentration 42 / 60What is the range of IR frequencies typically used in spectroscopy? A) 10–100 cm⁻¹ B) 400–4000 cm⁻¹ C) 1000–5000 cm⁻¹ D) 50–500 cm⁻¹ 43 / 60What is the primary reason for using a mixture of solvents in the mobile phase To increase the speed of separation To dissolve different components with varying polarities To decrease the Rf values of all compounds To prevent the paper from dissolving 44 / 60. Which detector is the most sensitive for detecting organic compounds in GC? Flame Ionization Detector (FID) Thermal Conductivity Detector (TCD) Electron Capture Detector (ECD) UV-Vis Detector 45 / 60Which acid radical is confirmed by the formation of a yellow precipitate with silver nitrate F Cl Br I 46 / 60Which resin type is most suitable for strong anion exchange chromatography Sulfonic acid resins Carboxyl resins Quaternary ammonium resins Hydroxylated silica resins 47 / 60What is the usual range of ¹H NMR chemical shifts? A) 0-100 ppm B) 0-200 ppm C) 0-12 ppm D) 100-1000 ppm 48 / 60In a titration curve, what does the steepest region indicate The buffer region The half-equivalence point The equivalence point he starting pH 49 / 60Why is pencil used instead of ink to draw the baseline in paper chromatography? Pencil marks do not dissolve in the solvent Pencil marks are easier to erase Pencil reacts with the solvent Ink improves the separation process 50 / 60In a titration of calcium with EDTA, which buffer is commonly used Acetate buffer Phosphate buffer Ammonia-ammonium chloride buffer Borate buffer 51 / 60In a flame test, lithium gives which characteristic color Yellow red green blue 52 / 60Which of the following is not a requirement for a precipitate in gravimetric analysis Large particle size High solubility Known composition purity 53 / 60Which solvent is commonly used in UV-Vis spectroscopy due to its transparency in the UV region Acetone Acetone methanol benzene Water 54 / 60What is the function of a masking agent in complexometric titration To enhance metal-ligand complex formation To change the color of the indicator To prevent interference from unwanted metal ions To reduce the solubility of the metal complex 55 / 60Which bond typically shows the highest wavenumber absorption in IR C–H O–H C=O C≡C 56 / 60In TLC, which type of compound typically moves the farthest up the plate? Polar compounds Non Polar compounds Ionic compounds Amphoteric compounds 57 / 60Hardness of water can be found by which titration acid base titration complexometric titration precipitation titration redox titration 58 / 60Which of the following is NOT an application of X-ray diffraction? a) Identifying unknown crystalline materials b) Studying polymer structures c) Determining the refractive index of liquids d) Examining defects in metals 59 / 60Which of the following is a common method of atomization in AAS? A) Infrared heating B) Gas chromatography C) Flame and graphite furnace atomization D) Electrochemical deposition 60 / 60Which of the following is used as a masking agent in gravimetric analysis EDTA Ammonium hydroxide Hydrochloric acid Sulfuric acid Your score isThe average score is 72% 0% Restart quiz
