#1
What is the purpose of a blank solution in chemical analysis?
To calibrate the instrument
To measure the background signal
To clean the glassware
To dilute the sample
#2
Which of the following is a common method for sample preparation in chemical analysis?
Filtration
Distillation
Crystallization
Sublimation
#3
What is the role of a reagent in chemical analysis?
To dilute the sample
To calibrate the instrument
To react with the analyte
To clean the glassware
#4
What is the purpose of a solvent in chemical analysis?
To react with the analyte
To dissolve the sample
To clean the glassware
To measure the volume of a gas
#5
What is the purpose of a titration in chemical analysis?
To measure the amount of analyte in a sample
To determine the color of a solution
To identify the chemical composition of a substance
To calculate the density of a solution
#6
What is the purpose of a calibration curve in chemical analysis?
To determine the concentration of an unknown sample
To calculate the molarity of a solution
To measure the volume of a gas
To identify the melting point of a substance
#7
What is the purpose of a standard addition method in chemical analysis?
To increase the precision of a measurement
To determine the concentration of an unknown analyte in a sample
To calculate the molarity of a solution
To identify impurities in a substance
#8
Which of the following techniques is commonly used to determine the structure of organic compounds?
Mass spectrometry
Infrared spectroscopy
Nuclear magnetic resonance (NMR) spectroscopy
Ultraviolet-visible (UV-Vis) spectroscopy
#9
Which of the following is a common indicator used in acid-base titrations?
Phenolphthalein
Methyl orange
Bromothymol blue
Litmus
#10
Which of the following is a primary standard in analytical chemistry?
Potassium dichromate
Sodium chloride
Hydrochloric acid
Sulfuric acid
#11
Which technique is commonly used to separate components in a mixture based on their molecular weight?
Gas chromatography
High-performance liquid chromatography (HPLC)
Size-exclusion chromatography
Thin-layer chromatography (TLC)
#12
What is the principle behind atomic absorption spectroscopy (AAS) in chemical analysis?
Absorption of light by ground-state atoms
Emission of light by excited-state atoms
Reflection of light by solid surfaces
Scattering of light by particles in a medium
#13
Which of the following is an example of a non-destructive analytical technique?
Titration
Mass spectrometry
Flame test
Nuclear magnetic resonance (NMR) spectroscopy
#14
Which of the following is a technique used to analyze the elemental composition of a sample?
X-ray diffraction (XRD)
Inductively coupled plasma mass spectrometry (ICP-MS)
Fourier transform infrared (FTIR) spectroscopy
Nuclear magnetic resonance (NMR) spectroscopy