Q. In a titration to identify chloride ions, which indicator is commonly used?
A.
Phenolphthalein
B.
Methyl orange
C.
Silver nitrate
D.
Chromate
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Solution
Chromate is used as an indicator in titrations involving chloride ions, as it forms a colored precipitate with silver ions.
Correct Answer:
D
— Chromate
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Q. In electrophoresis, what property of ions primarily determines their movement?
A.
Mass
B.
Charge
C.
Size
D.
Solubility
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Solution
The movement of ions in electrophoresis is primarily determined by their charge; positively charged ions move towards the cathode.
Correct Answer:
B
— Charge
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Q. In UV-Vis spectroscopy, what does a peak at 260 nm typically indicate?
A.
Presence of proteins
B.
Presence of nucleic acids
C.
Presence of carbohydrates
D.
Presence of lipids
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Solution
A peak at 260 nm in UV-Vis spectroscopy typically indicates the presence of nucleic acids, as they absorb light at this wavelength.
Correct Answer:
B
— Presence of nucleic acids
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Q. What is the main advantage of using ion chromatography for qualitative analysis?
A.
High sensitivity
B.
Ability to analyze gases
C.
Separation of ions in a single run
D.
Low cost
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Solution
Ion chromatography allows for the separation of multiple ions in a single run, making it efficient for qualitative analysis.
Correct Answer:
C
— Separation of ions in a single run
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Q. What is the primary purpose of using a flame test in qualitative analysis?
A.
To determine the concentration of ions
B.
To identify the presence of specific metal ions
C.
To separate different ions
D.
To measure the pH of a solution
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Solution
A flame test is used to identify the presence of specific metal ions based on the characteristic colors they emit when heated in a flame.
Correct Answer:
B
— To identify the presence of specific metal ions
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Q. What is the principle behind the use of chromatography for qualitative analysis?
A.
Separation based on charge
B.
Separation based on size
C.
Separation based on solubility
D.
Separation based on boiling point
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Solution
Chromatography separates components based on their solubility in the mobile phase relative to the stationary phase.
Correct Answer:
C
— Separation based on solubility
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Q. What is the role of a titrant in a titration for qualitative analysis?
A.
To provide a color change
B.
To react with the analyte
C.
To stabilize the solution
D.
To dilute the sample
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Solution
The titrant reacts with the analyte to produce a measurable change, often indicated by a color change, which helps identify the analyte.
Correct Answer:
B
— To react with the analyte
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Q. What is the significance of using a buffer solution in qualitative analysis?
A.
To increase the solubility of ions
B.
To maintain a constant pH
C.
To enhance the color intensity
D.
To precipitate unwanted ions
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Solution
Buffer solutions are used to maintain a constant pH during qualitative analysis, which is crucial for accurate results.
Correct Answer:
B
— To maintain a constant pH
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Q. Which analytical technique is best suited for the separation of anions in a mixture?
A.
Gas chromatography
B.
High-performance liquid chromatography
C.
Thin-layer chromatography
D.
Capillary electrophoresis
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Solution
Capillary electrophoresis is particularly effective for the separation of anions due to its high resolution and speed.
Correct Answer:
D
— Capillary electrophoresis
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Q. Which of the following ions can be detected using a colorimetric method?
A.
Sodium
B.
Calcium
C.
Iron
D.
Potassium
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Solution
Iron can be detected using colorimetric methods, as it forms colored complexes with specific reagents.
Correct Answer:
C
— Iron
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Q. Which reagent is commonly used to confirm the presence of chloride ions in a solution?
A.
Barium nitrate
B.
Silver nitrate
C.
Calcium hydroxide
D.
Sodium sulfate
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Solution
Silver nitrate is used to precipitate silver chloride when chloride ions are present, confirming their presence.
Correct Answer:
B
— Silver nitrate
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Q. Which technique is best suited for separating anions in a mixture?
A.
Gas chromatography
B.
High-performance liquid chromatography
C.
Capillary electrophoresis
D.
Mass spectrometry
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Solution
Capillary electrophoresis is effective for separating anions based on their charge and size.
Correct Answer:
C
— Capillary electrophoresis
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Showing 1 to 12 of 12 (1 Pages)
The Qualitative Analysis of Ions – Numerical Applications section integrates quantitative reasoning with classical qualitative analysis , helping students apply numerical calculations to explain precipitation, separation, and confirmation of ions . This module is designed for advanced school students, undergraduate learners, and competitive exam aspirants , where numbers-based reasoning strengthens conceptual clarity .
In this section, you will work on:
Ksp-based calculations to predict precipitation and selective separation of ions
Common ion effect numericals in group analysis
pH and concentration calculations affecting solubility and precipitation
Ionic concentration comparisons for group reagent selection
Complex formation equilibrium numericals (Kf and conditional solubility)
Redox-based stoichiometric calculations in qualitative reactions
Limiting reagent and equilibrium shift problems in confirmatory tests
Exam-oriented numerical MCQs with step-by-step solutions
PYQ-style numerical problems aligned with NEET/JEE/UG exams
The content is structured to bridge theory and calculation , improve analytical accuracy , and help students handle numerical-based qualitative analysis questions confidently .
Master numerical applications in Qualitative Analysis of Ions to strengthen equilibrium understanding and gain an edge in competitive and undergraduate examinations .
