Qualitative Analysis of Ions - Case Studies
Q. In a flame test, which color indicates the presence of sodium ions?
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A.
Green
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B.
Red
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C.
Yellow
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D.
Blue
Solution
Sodium ions produce a characteristic bright yellow color when subjected to a flame test.
Correct Answer: C — Yellow
Q. In qualitative analysis, what does a positive result in a precipitation test indicate?
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A.
The absence of ions
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B.
The presence of specific ions
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C.
The need for further testing
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D.
The presence of impurities
Solution
A positive result in a precipitation test indicates that specific ions are present in the solution, forming an insoluble compound.
Correct Answer: B — The presence of specific ions
Q. What is the main advantage of using chromatography for qualitative analysis?
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A.
It provides quantitative results
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B.
It can separate complex mixtures
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C.
It requires minimal sample preparation
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D.
It is the fastest method available
Solution
Chromatography excels in separating complex mixtures, allowing for the identification of individual components within a sample.
Correct Answer: B — It can separate complex mixtures
Q. What is the primary purpose of qualitative analysis in ion detection?
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A.
To determine the concentration of ions
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B.
To identify the presence of specific ions
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C.
To separate ions from a mixture
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D.
To quantify the total ion content
Solution
Qualitative analysis focuses on identifying the presence of specific ions in a sample rather than quantifying their concentrations.
Correct Answer: B — To identify the presence of specific ions
Q. What is the role of a pH indicator in a titration for qualitative analysis?
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A.
To measure the temperature of the solution
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B.
To indicate the endpoint of the titration
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C.
To separate ions in the solution
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D.
To enhance the color of the solution
Solution
A pH indicator changes color at a specific pH level, signaling the endpoint of the titration, which helps in identifying the presence of certain ions.
Correct Answer: B — To indicate the endpoint of the titration
Q. What is the significance of using a control sample in qualitative ion analysis?
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A.
To increase the sample size
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B.
To ensure the accuracy of measurements
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C.
To provide a reference for comparison
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D.
To reduce the time of analysis
Solution
A control sample serves as a reference for comparison, helping to confirm the presence or absence of specific ions in the test sample.
Correct Answer: C — To provide a reference for comparison
Q. Which ion is typically detected using a silver nitrate test?
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A.
Chloride
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B.
Sulfate
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C.
Nitrate
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D.
Phosphate
Solution
The silver nitrate test is commonly used to detect chloride ions, which form a white precipitate of silver chloride.
Correct Answer: A — Chloride
Q. Which of the following methods can be used to identify cations in a solution?
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A.
Thin Layer Chromatography
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B.
Electrophoresis
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C.
Flame Photometry
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D.
All of the above
Solution
All of the listed methods can be employed to identify cations in a solution through various analytical techniques.
Correct Answer: D — All of the above
Q. Which spectroscopy technique is best suited for identifying functional groups in organic ions?
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A.
Infrared Spectroscopy
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B.
Ultraviolet-Visible Spectroscopy
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C.
Nuclear Magnetic Resonance
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D.
Raman Spectroscopy
Solution
Infrared Spectroscopy is particularly effective for identifying functional groups in organic compounds by measuring molecular vibrations.
Correct Answer: A — Infrared Spectroscopy
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