#1
Which laboratory technique is commonly used to separate components of a mixture based on their solubility?
Distillation
Filtration
Chromatography
Decantation
#2
What is the purpose of a fume hood in a laboratory?
To store chemicals safely
To prevent exposure to hazardous fumes
To heat substances evenly
To measure precise volumes of liquids
#3
What is the purpose of a magnetic stirrer in a laboratory?
To heat solutions
To mix solutions using a magnetic field
To measure pH
To measure mass
#4
What is the purpose of a Bunsen burner in a laboratory?
To measure mass accurately
To heat substances with a consistent flame
To measure temperature
To measure volume
#5
What is the purpose of a burette in a laboratory?
To measure temperature
To measure pH
To measure volume of liquids with high precision
To heat substances
#6
What is the purpose of a centrifuge in a laboratory?
To measure mass accurately
To mix solutions
To separate components of a mixture based on density
To measure temperature
#7
Which laboratory technique is used to separate and purify compounds based on their boiling points?
Filtration
Distillation
Crystallization
Sublimation
#8
Which laboratory instrument is commonly used to measure the volume of a liquid?
Spectrophotometer
Centrifuge
Burette
Pipette
#9
What is the purpose of a desiccator in a laboratory?
To measure temperature accurately
To store volatile liquids
To dry substances by removing moisture
To perform titrations
#10
Which laboratory technique is used to separate proteins based on their size and charge?
High-performance liquid chromatography (HPLC)
Gel electrophoresis
Thin-layer chromatography (TLC)
Column chromatography
#11
Which laboratory apparatus is used to measure the melting point of a substance?
Spectrophotometer
Melting point apparatus
Buret
Crucible
#12
Which laboratory technique is used to determine the concentration of a solution?
Titration
Extraction
Recrystallization
Decantation
#13
Which laboratory technique is used to separate DNA fragments based on their size?
Polymerase chain reaction (PCR)
Gel electrophoresis
Western blot
Spectrophotometry
#14
What is the purpose of a desiccant in a laboratory desiccator?
To prevent chemical reactions
To absorb moisture
To measure temperature
To measure pH
#15
Which laboratory technique is used to identify the components of a compound based on their mass-to-charge ratio?
Nuclear magnetic resonance (NMR)
Mass spectrometry
Gas chromatography
Infrared spectroscopy
#16
Which laboratory technique is used to determine the structure of molecules by analyzing their interaction with polarized light?
Nuclear magnetic resonance (NMR)
Mass spectrometry
Infrared spectroscopy
Polarimetry
#17
Which laboratory technique is used to determine the molecular structure of a compound by analyzing its nuclear spins?
Infrared spectroscopy
Mass spectrometry
Nuclear magnetic resonance (NMR)
Polarimetry