Muntaha Nasir CHEMISTRY - Analytical Chemistry

Which technique is used for the separation of chiral compounds?

A. Gas Chromatography. B. Liquid Chromatography. C. Chiral Chromatography. D. Ion-Exchange Chromatography.

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Muntaha Nasir CHEMISTRY - Analytical Chemistry

What is the role of a nebulizer in Atomic Absorption Spectroscopy (AAS)?

A. To atomize the sample. B. To ionize the sample. C. To vaporize the sample. D. To mix the sample with the fuel.

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Explanation

The nebulizer in AAS converts the liquid sample into a fine aerosol for atomization.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

In cyclic voltammetry, what information can be obtained from the peak current?

A. Concentration of analyte. B. Rate of electron transfer. C. Diffusion coefficient. D. Electrode surface area.

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Explanation

The peak current in cyclic voltammetry is proportional to the concentration of the analyte in the solution.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

What is the primary use of Differential Scanning Calorimetry (DSC)?

A. Measuring thermal stability. B. Measuring electrical conductivity. C. Measuring chemical composition. D. Measuring optical properties.

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Explanation

DSC measures the heat flow associated with phase transitions to assess thermal stability and other properties.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

Which of the following is a non-destructive analytical technique?

A. Mass Spectrometry. B. UV-Vis Spectroscopy. C. IR Spectroscopy. D. X-ray Fluorescence (XRF).

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Explanation

XRF is a non-destructive technique used to determine the elemental composition of materials.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

What is the main advantage of using a capillary column in Gas Chromatography?

A. Higher resolution. B. Faster analysis. C. Lower cost. D. Easier maintenance.

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Explanation

Capillary columns in GC provide higher resolution and efficiency due to their smaller diameter and longer length.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

In potentiometry, what does the Nernst equation relate to?

A. Concentration and potential. B. Temperature and potential. C. Pressure and potential. D. Volume and potential.

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The Nernst equation relates the electrode potential to the concentration of ions in solution.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

What is the principle of Ion-Exchange Chromatography?

A. Separation based on polarity. B. Separation based on size. C. Separation based on charge. D. Separation based on affinity.

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Explanation

Ion-Exchange Chromatography separates ions and polar molecules based on their affinity to ion exchangers.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

Which of the following is NOT a type of detector used in Liquid Chromatography (LC)?

A. UV-Vis Detector. B. Flame Ionization Detector (FID). C. Refractive Index Detector. D. Mass Spectrometer.

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Explanation

FID is commonly used in GC, not LC. LC detectors include UV-Vis, Refractive Index, and Mass Spectrometers.

Muntaha Nasir CHEMISTRY - Analytical Chemistry

What is the main purpose of using an internal standard in quantitative analysis?

A. To improve sensitivity. B. To calibrate the instrument. C. To correct for variations in sample preparation and analysis. D. To identify the analyte.

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Explanation

An internal standard is used to account for variability in sample preparation and analysis, ensuring accurate quantitation.