5. Which of the following statements is not correct?

Question

A. Bulk samples are also called gross samples
B. A bulk sample is taken from a lot
C. Bulk samples are always taken from laboratory samples
D. Bulk Samples are very small quantities of samples to be analyzed
6. When performing an analysis a chemist often uses a standard solution. A standard solution is:
A. A solution that is prepared from a chemical that has been designated as a primary standard.
B. A solution that has a concentration of a chemical that is known to a high degree of certainty
C. A solution that is prepared with high degree of precision
D. A solution that complies with standards established by the Environmental Protection Agency
7. UV spectroscopy works on which of the following phenomenon?
A. Absorption
B. Elution
C. Adsorption
D. Emission
8. The steps in a chemical analysis are:
A. 1. Formulate the question. 2. Select the analytical procedure. 3. Sampling. 4. Prepare the
sample. 5. Make replicate measurements of the sample
B. 1. Select the analytical procedure. 2. Sampling. 3. Prepare the sample. 4. Make replicate
measurements of the sample. 5. Make a clear and complete written report of your findings.
C. Formulate the question. 2. Select the analytical procedure. 3. Sampling. 4. Prepare the sample.
5. Make replicate measurements of the sample. 6. Make a clear and complete written report of
your findings.
D. 1. Formulate the question. 2. Select the analytical procedure. 3. Sampling. 4. Prepare the
sample. 5. Perform analysis. 6. Make a clear and complete written report of your findings.
9. Which of the following statements is false about UV-Spectroscopy?
A. Low temperature gives better results in UV spectroscopy
B. Chloroform is used as a solvent in spectroscopy
C. Benzene is not used as solvent in UV spectroscopy
D. None of the above
10. Which of the following is true about IR Spectroscopy? It is used for:
A. Structural identification
B. Functional group identification
C. Metal detection
D. Classical analysis
11. One of the following is not true about chromatography
A. Substances are separated based on affinity
B. There are always a mobile phase and a stationary phase
C. Gravity column chromatography requires and energy source
D. The mobile phase moves along with some components of the mixture and are separated

Answer 1

Here are the correct answers to the questions you've provided:

5. Which of the following statements is not correct? Answer: C. Bulk samples are always taken from laboratory samples.
Explanation: Bulk samples are taken from larger lots or populations, not specifically from laboratory samples.

6. When performing an analysis a chemist often uses a standard solution. A standard solution is: Answer: B. A solution that has a concentration of a chemical that is known to a high degree of certainty.
Explanation: This definition accurately reflects the nature of a standard solution, as it is typically used for quantitative analysis.

7. UV spectroscopy works on which of the following phenomenon? Answer: A. Absorption.
Explanation: UV spectroscopy involves the absorption of ultraviolet light by molecules.

8. The steps in a chemical analysis are: Answer: D. 1. Formulate the question. 2. Select the analytical procedure. 3. Sampling. 4. Prepare the sample. 5. Perform analysis. 6. Make a clear and complete written report of your findings.
Explanation: This sequence accurately represents the comprehensive steps involved in conducting a chemical analysis.

9. Which of the following statements is false about UV-Spectroscopy? Answer: A. Low temperature gives better results in UV spectroscopy.
Explanation: This statement is generally false; temperature effects can vary, and higher temperatures may improve the solubility of solutes but can also affect the spectra.

10. Which of the following is true about IR Spectroscopy? It is used for: Answer: A. Structural identification and B. Functional group identification.
Explanation: Both A and B are correct as IR spectroscopy is commonly used for identifying functional groups and providing insights into the molecular structure.

11. One of the following is not true about chromatography: Answer: C. Gravity column chromatography requires an energy source.
Explanation: Gravity column chromatography does not require an external energy source; it operates under the influence of gravity alone.

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