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Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
In Liquid Chromatography, what does the term 'isocratic' refer to?
A. Constant flow rate.
B. Constant temperature.
C. Constant mobile phase composition.
D. Constant pressure.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
Which technique is best suited for the quantitative analysis of metals in a sample?
A. UV-Vis Spectroscopy.
B. Atomic Absorption Spectroscopy (AAS).
C. NMR Spectroscopy.
D. Gas Chromatography.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
What is the primary application of X-ray diffraction (XRD) in analytical chemistry?
A. Determining molecular weight.
B. Analyzing the chemical composition.
C. Studying the crystal structure.
D. Measuring the absorbance.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
In FTIR spectroscopy, what does 'FT' stand for?
A. Fourier Transform.
B. Frequency Transfer.
C. Fast Transmission.
D. Functional Titration.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
Which of the following is a common method for sample preparation in Trace Metal Analysis?
A. Solid-phase extraction.
B. Liquid-liquid extraction.
C. Digestion.
D. Filtration.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
What is the principle of Gel Electrophoresis?
A. Separation based on molecular weight.
B. Separation based on charge.
C. Separation based on solubility.
D. Separation based on affinity.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
In titration, what is the role of an indicator?
A. To react with the analyte.
B. To stabilize the pH.
C. To signal the end point.
D. To act as a buffer.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
Which method is used to determine the particle size distribution in a sample?
A. UV-Vis Spectroscopy.
B. Dynamic Light Scattering (DLS).
C. NMR Spectroscopy.
D. Gas Chromatography.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
In NMR spectroscopy, what does the chemical shift represent?
A. The resonance frequency of nuclei.
B. The magnetic field strength.
C. The energy of the nuclei.
D. The number of nuclei.
Muntaha Nasir
CHEMISTRY
-
Analytical Chemistry
What is the purpose of a blank solution in spectrophotometry?
A. To calibrate the instrument.
B. To remove background interference.
C. To increase the absorbance.
D. To decrease the noise.
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