Qualitative Analysis of Ions - Competitive Exam Level
Q. In gas chromatography, what is the stationary phase typically made of?
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A.
Liquid
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B.
Solid
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C.
Gas
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D.
Plasma
Solution
In gas chromatography, the stationary phase is typically a liquid coated on a solid support.
Correct Answer: A — Liquid
Q. In infrared spectroscopy, which functional group is typically identified by a strong peak around 1700 cm-1?
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A.
Alcohol
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B.
Aldehyde
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C.
Carboxylic acid
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D.
Ketone
Solution
The strong peak around 1700 cm-1 is characteristic of the carbonyl (C=O) stretch found in ketones.
Correct Answer: D — Ketone
Q. What is the primary purpose of using a mobile phase in chromatography?
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A.
To stabilize the stationary phase
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B.
To carry the sample through the stationary phase
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C.
To increase the temperature
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D.
To enhance detection sensitivity
Solution
The mobile phase carries the sample through the stationary phase, allowing for separation based on different affinities.
Correct Answer: B — To carry the sample through the stationary phase
Q. Which of the following ions can be detected using flame tests?
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A.
Sodium
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B.
Calcium
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C.
Barium
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D.
All of the above
Solution
Flame tests can be used to detect various metal ions, including sodium, calcium, and barium.
Correct Answer: D — All of the above
Q. Which of the following ions would produce a white precipitate when treated with silver nitrate?
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A.
Sodium
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B.
Chloride
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C.
Potassium
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D.
Nitrate
Solution
Chloride ions react with silver nitrate to form a white precipitate of silver chloride.
Correct Answer: B — Chloride
Q. Which of the following methods is primarily used for the qualitative analysis of anions?
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A.
Titration
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B.
Chromatography
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C.
Spectroscopy
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D.
Precipitation reactions
Solution
Precipitation reactions are commonly used to identify anions by forming insoluble salts.
Correct Answer: D — Precipitation reactions
Q. Which spectroscopic technique is most effective for identifying functional groups in organic compounds?
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A.
NMR
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B.
UV-Vis
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C.
IR
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D.
Mass Spectrometry
Solution
Infrared (IR) spectroscopy is particularly effective for identifying functional groups due to characteristic absorption bands.
Correct Answer: C — IR
Q. Which technique is best suited for the separation of charged particles in a solution?
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A.
Titration
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B.
Chromatography
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C.
Electrophoresis
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D.
Spectroscopy
Solution
Electrophoresis is specifically designed to separate charged particles based on their size and charge.
Correct Answer: C — Electrophoresis
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