Analytical Techniques

Q. In UV-Vis spectroscopy, what does a shift in the absorption peak indicate?
  • A. Change in concentration
  • B. Change in pH
  • C. Change in molecular structure
  • D. Change in temperature
Q. In UV-Vis spectroscopy, what does the Beer-Lambert law relate?
  • A. Wavelength and energy
  • B. Absorbance and concentration
  • C. Frequency and intensity
  • D. Temperature and pressure
Q. In UV-Vis spectroscopy, what is the effect of increasing the path length of the sample cell?
  • A. Decreases absorbance
  • B. Increases absorbance
  • C. No effect on absorbance
  • D. Increases transmittance
Q. What does a broad peak in an IR spectrum typically indicate?
  • A. Strong hydrogen bonding
  • B. Weak molecular interactions
  • C. High molecular weight
  • D. Low concentration
Q. What does a positive test for sulfate ions typically produce when barium chloride is added?
  • A. A blue solution
  • B. A white precipitate
  • C. A yellow solution
  • D. No change
Q. What does the peak position in an IR spectrum indicate?
  • A. Concentration of the sample
  • B. Molecular weight of the compound
  • C. Type of functional groups present
  • D. Purity of the sample
Q. What does the term 'Beer-Lambert Law' describe?
  • A. The relationship between temperature and absorbance
  • B. The relationship between concentration and absorbance
  • C. The relationship between wavelength and absorbance
  • D. The relationship between time and absorbance
Q. What does the term 'chromophore' refer to in UV-Vis spectroscopy?
  • A. A molecule that fluoresces
  • B. A part of a molecule responsible for its color
  • C. A solvent used in the analysis
  • D. A detector used in the instrument
Q. What does the term 'retention time' refer to in chromatography?
  • A. The time taken for a sample to be injected
  • B. The time taken for a component to pass through the detector
  • C. The time a component spends in the stationary phase
  • D. The total time of the chromatographic run
Q. What indicator is commonly used in a strong acid-strong base titration?
  • A. Phenolphthalein
  • B. Methyl orange
  • C. Bromothymol blue
  • D. Litmus
Q. What is a back titration?
  • A. Titration of a solution with a known concentration
  • B. Titration where the endpoint is determined by color change
  • C. Titration of an excess reagent followed by titration of the excess
  • D. Titration that uses a solid reagent
Q. What is a common application of complexometric titration?
  • A. Determining the concentration of metals in solution
  • B. Measuring the acidity of a solution
  • C. Analyzing the purity of organic compounds
  • D. Identifying unknown substances
Q. What is a common application of IR spectroscopy in environmental analysis?
  • A. Measuring pH levels
  • B. Identifying pollutants
  • C. Determining molecular weight
  • D. Separating mixtures
Q. What is a common application of titration in the food industry?
  • A. Measuring the viscosity of oils
  • B. Determining the acidity of fruit juices
  • C. Analyzing the color of beverages
  • D. Separating food additives
Q. What is a common mistake made during titration?
  • A. Using a burette for titrant delivery
  • B. Not swirling the flask during titration
  • C. Using a pH meter for endpoint detection
  • D. Adding titrant too slowly
Q. What is a common mistake to avoid during a titration?
  • A. Using a burette for accurate measurement
  • B. Adding titrant too quickly
  • C. Using a proper indicator
  • D. Recording the final volume accurately
Q. What is a common mistake to avoid during titration?
  • A. Adding titrant too quickly
  • B. Using a clean burette
  • C. Measuring the volume accurately
  • D. Using the correct indicator
Q. What is a common mistake when performing a titration?
  • A. Not swirling the flask
  • B. Using too much titrant
  • C. Not recording the initial volume
  • D. All of the above
Q. What is a common use of UV-Vis spectroscopy in environmental analysis?
  • A. Measuring soil pH
  • B. Detecting heavy metals
  • C. Analyzing water quality
  • D. Identifying microorganisms
Q. What is a primary standard in titration?
  • A. A solution of known concentration
  • B. A pure substance used to prepare a solution
  • C. An indicator used in titration
  • D. A method of measuring pH
Q. What is a typical application of UV-Vis spectroscopy in food analysis?
  • A. Measuring pH
  • B. Determining fat content
  • C. Analyzing color and pigments
  • D. Identifying microbial contamination
Q. What is the Beer-Lambert Law equation?
  • A. A = εcl
  • B. A = c/εl
  • C. A = l/εc
  • D. A = cl/ε
Q. What is the Beer-Lambert Law used for in UV-Vis spectroscopy?
  • A. To calculate the wavelength of light
  • B. To determine the concentration of a solution
  • C. To measure the intensity of emitted light
  • D. To analyze the molecular structure
Q. What is the coordination number of a metal in a complex with six ligands?
  • A. 2
  • B. 4
  • C. 6
  • D. 8
Q. What is the effect of increasing the concentration of a reactant in a titration?
  • A. Increases the volume of titrant needed
  • B. Decreases the volume of titrant needed
  • C. Has no effect on the titration
  • D. Changes the endpoint color
Q. What is the effect of increasing the path length in a UV-Vis spectrophotometer?
  • A. Decreases absorbance
  • B. Increases absorbance
  • C. No effect on absorbance
  • D. Increases wavelength
Q. What is the effect of temperature on titration results?
  • A. It has no effect
  • B. It can change the solubility of the analyte
  • C. It affects the volume of the titrant
  • D. It alters the pH of the solutions
Q. What is the endpoint of a titration?
  • A. The point where the reaction is complete
  • B. The point where the solution is neutral
  • C. The point where the indicator changes color
  • D. The point where the titrant is exhausted
Q. What is the IUPAC name for the compound with the formula C3H6O?
  • A. Propanal
  • B. Propan-2-one
  • C. Cyclopropanol
  • D. Propene
Q. What is the main advantage of high-performance liquid chromatography (HPLC) over traditional liquid chromatography?
  • A. Higher resolution and speed
  • B. Lower cost of operation
  • C. Simpler instrumentation
  • D. Use of larger sample volumes
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