Qualitative Analysis of Ions - Competitive Exam Level
Q. In electrophoresis, what determines the direction of ion movement?
A.
Molecular weight
B.
Charge of the ion
C.
Solubility
D.
Temperature
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Solution
The direction of ion movement in electrophoresis is determined by the charge of the ion; cations move towards the cathode and anions towards the anode.
Correct Answer: B — Charge of the ion
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Q. In flame tests, which color is produced by the presence of sodium ions?
A.
Green
B.
Red
C.
Yellow
D.
Blue
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Solution
Sodium ions produce a characteristic bright yellow color in flame tests.
Correct Answer: C — Yellow
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Q. In gas chromatography, what is the stationary phase typically made of?
A.
Liquid
B.
Solid
C.
Gas
D.
Plasma
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Solution
In gas chromatography, the stationary phase is typically a liquid coated on a solid support.
Correct Answer: A — Liquid
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Q. In infrared spectroscopy, which functional group is typically identified by a strong peak around 1700 cm-1?
A.
Alcohol
B.
Aldehyde
C.
Carboxylic acid
D.
Ketone
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Solution
The strong peak around 1700 cm-1 is characteristic of the carbonyl (C=O) stretch found in ketones.
Correct Answer: D — Ketone
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Q. What is the primary principle behind ion chromatography?
A.
Size exclusion
B.
Ion exchange
C.
Affinity
D.
Adsorption
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Solution
Ion chromatography operates on the principle of ion exchange, separating ions based on their charge.
Correct Answer: B — Ion exchange
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Q. What is the primary purpose of using a mobile phase in chromatography?
A.
To stabilize the stationary phase
B.
To carry the sample through the stationary phase
C.
To increase the temperature
D.
To enhance detection sensitivity
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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
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Q. Which of the following ions can be detected using flame tests?
A.
Sodium
B.
Calcium
C.
Barium
D.
All of the above
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Solution
Flame tests can be used to detect various metal ions, including sodium, calcium, and barium.
Correct Answer: D — All of the above
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Q. Which of the following ions can be identified using a flame photometer?
A.
Calcium
B.
Iron
C.
Copper
D.
Lead
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Solution
Flame photometry is commonly used to identify alkali and alkaline earth metal ions, such as calcium, based on their characteristic emission spectra.
Correct Answer: A — Calcium
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Q. Which of the following ions would produce a white precipitate when treated with silver nitrate?
A.
Sodium
B.
Chloride
C.
Potassium
D.
Nitrate
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Solution
Chloride ions react with silver nitrate to form a white precipitate of silver chloride.
Correct Answer: B — Chloride
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Q. Which of the following methods is primarily used for the qualitative analysis of anions?
A.
Titration
B.
Chromatography
C.
Spectroscopy
D.
Precipitation reactions
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Solution
Precipitation reactions are commonly used to identify anions by forming insoluble salts.
Correct Answer: D — Precipitation reactions
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Q. Which of the following techniques can be used to identify metal cations in a solution?
A.
UV-Vis Spectroscopy
B.
Gas Chromatography
C.
Mass Spectrometry
D.
Thin Layer Chromatography
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Solution
UV-Vis Spectroscopy can be used to identify metal cations based on their characteristic absorbance spectra.
Correct Answer: A — UV-Vis Spectroscopy
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Q. Which qualitative analysis technique is best for separating complex mixtures of organic compounds?
A.
Gas Chromatography
B.
Liquid Chromatography
C.
Paper Chromatography
D.
Capillary Electrophoresis
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Solution
Liquid Chromatography is effective for separating complex mixtures of organic compounds based on their interactions with the stationary phase.
Correct Answer: B — Liquid Chromatography
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Q. Which spectroscopic technique is most effective for identifying functional groups in organic compounds?
A.
NMR
B.
UV-Vis
C.
IR
D.
Mass Spectrometry
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Solution
Infrared (IR) spectroscopy is particularly effective for identifying functional groups due to characteristic absorption bands.
Correct Answer: C — IR
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Q. Which technique is best suited for the separation of charged particles in a solution?
A.
Titration
B.
Chromatography
C.
Electrophoresis
D.
Spectroscopy
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Solution
Electrophoresis is specifically designed to separate charged particles based on their size and charge.
Correct Answer: C — Electrophoresis
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