Qualitative Analysis of Ions - Problem Set
Q. What is the main principle behind the use of UV-Vis spectroscopy in qualitative analysis?
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A.
It measures the mass of a sample
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B.
It detects the presence of specific ions based on their absorbance
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C.
It separates components based on their charge
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D.
It identifies compounds based on their melting points
Solution
UV-Vis spectroscopy identifies compounds by measuring their absorbance at specific wavelengths, which correlates with the presence of certain ions.
Correct Answer: B — It detects the presence of specific ions based on their absorbance
Q. What is the purpose of using a buffer solution in electrophoresis?
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A.
To increase the conductivity of the solution
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B.
To maintain a constant pH during the separation
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C.
To enhance the visibility of the bands
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D.
To prevent overheating of the gel
Solution
Buffer solutions maintain a stable pH, which is crucial for the proper separation of charged molecules during electrophoresis.
Correct Answer: B — To maintain a constant pH during the separation
Q. What is the role of a pH indicator in a titration?
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A.
To increase the reaction rate
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B.
To provide a color change at the endpoint
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C.
To stabilize the solution
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D.
To dilute the reactants
Solution
A pH indicator changes color at a specific pH range, signaling the endpoint of the titration.
Correct Answer: B — To provide a color change at the endpoint
Q. Which electrophoresis technique is best suited for separating nucleic acids?
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A.
Capillary Electrophoresis
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B.
Gel Electrophoresis
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C.
Isoelectric Focusing
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D.
Two-Dimensional Electrophoresis
Solution
Gel Electrophoresis is commonly used for the separation of nucleic acids based on size.
Correct Answer: B — Gel Electrophoresis
Q. Which of the following ions can be detected using a silver nitrate test?
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A.
Chloride ions
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B.
Sulfate ions
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C.
Nitrate ions
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D.
Phosphate ions
Solution
Chloride ions react with silver nitrate to form a white precipitate of silver chloride, indicating their presence.
Correct Answer: A — Chloride ions
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