Free Analytical Chemistry MCQs with Answers

1. The branch of chemistry which deals with the analysis of chemical products is known as

• A. Physical chemistry
• B. Organic chemistry
• C. Inorganic chemistry
• D. Analytical chemistry

Explanation: Analytical chemistry is the specific field of chemistry dedicated to obtaining, processing, and communicating information about the composition and structure of matter. It involves the separation, identification (qualitative), and quantification (quantitative) of chemical compounds.

2. The process of identifying the component present in a sample is called

• A. Quantitative analysis
• B. Qualitative analysis
• C. Volumetric analysis
• D. Gravimetric analysis

Explanation: Qualitative analysis focuses on identifying the constituent elements and compounds present in a sample. It answers the question "What is present?" rather than "How much is present?".

3. The process of determining amounts of each of the components in a sample of matter is termed as

• A. Gravimetric analysis
• B. Coulometric analysis
• C. Quantitative analysis
• D. Qualitative analysis

Explanation: Quantitative analysis is concerned with measuring the exact amount or concentration of specific substances within a sample. It provides numerical data, answering the question "How much is present?".

4. Which property is used in volumetric methods of analysis?

• A. Density
• B. Viscosity
• C. Surface tension
• D. Volume

Explanation: Volumetric analysis, such as titration, relies on the precise measurement of the volume of a solution of known concentration that is required to react completely with the analyte. Therefore, volume is the key physical property measured.

5. Conductometry is based on

• A. Electric current
• B. Electrical potential
• C. Dielectric constant
• D. Electrical conductance

Explanation: Conductometry is an analytical technique that measures the electrical conductance of a solution. This property depends on the concentration and mobility of ions, allowing for the determination of concentrations or endpoints of titrations.

6. Potentiometry is based on the measurement of which physical property?

• A. Electrical conductance
• B. Electrical potential
• C. Thermal conductance
• D. Voltage

Explanation: Potentiometry is an electrochemical method that involves measuring the electrical potential (voltage) difference between two electrodes in an electrochemical cell. This potential is related to the concentration of specific ions in the solution.

7. Coulometry is based on the measurement of

• A. Electrical current
• B. Electrical potential
• C. Electrical conductance
• D. Dielectric constant

Explanation: Coulometry is an analytical technique where the quantity of a substance is determined by measuring the total electric charge (in Coulombs) required to completely electrolyze it. This is based on Faraday's laws of electrolysis.

8. The current-voltage characteristics forms the basis of

• A. Thermal analysis
• B. Potentiometry
• C. Conductometry
• D. Polarography

Explanation: Polarography is a type of voltammetry where the potential of a dropping mercury electrode is varied and the resulting current is measured. The resulting current-voltage curve, or polarogram, provides information about the analyte.

9. Which of the following technique is based on the absorption of light radiation?

• A. Spectrophotometry
• B. Colorimetry
• C. NMR
• D. All the above techniques

Explanation: Spectrophotometry and colorimetry both measure the amount of light absorbed by a substance to determine its concentration. Nuclear Magnetic Resonance (NMR) spectroscopy involves the absorption of radiofrequency radiation by atomic nuclei in a magnetic field.

10. Which of the following analytical technique is based on the emission of light radiation?

• A. Flame photometry
• B. Atomic absorption spectrophotometry
• C. Raman spectroscopy
• D. Conductometry

Explanation: In flame photometry, a sample is introduced into a flame, causing atoms to become electronically excited. As they return to their ground state, they emit light at characteristic wavelengths, and the intensity of this emission is measured.