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#analytical chemistry

19 public questions tagged with this topic.

CHEMISTRY

In the Carius method, 0.25 g of a compound gave 0.574 g of AgBr . What is the percentage of bromine? (Atomic masses: Ag

Given: In the Carius method, 0.25 g of a compound gave 0.574 g of AgBr . What is the percentage of bromine? (Atomic masses: Ag = 108, Br = 80) These values define the system as per NCERT data. Formula: Molar mass of AgBr = 108 + 80 = 188 g/mol. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Mass of Br = 80 × 0.574/188 = 0.244 g. Percentage = 0.244 × 100/0.25 = 97.6% . Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Relevant Chemistry topic covering principles and examples as per NCERT.

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CHEMISTRY

In the Carius method, which reagent is used to precipitate sulphur as BaSOâ‚„ ?

Sulphur is oxidized to Hâ‚‚SOâ‚„, which reacts with BaClâ‚‚ to form a white precipitate of BaSOâ‚„ in the Carius method. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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CHEMISTRY

Which method is used to detect phosphorus in an organic compound by converting it to phosphate?

In the Carius method, phosphorus is oxidized with HNO₃ to form H₃PO₄, which is precipitated as ammonium phosphomolybdate. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Organic Chemistry - Basic Principles, Hydrocarbons and Reaction Mechanisms, Topic: Nomenclature, isomerism and reaction types.

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CHEMISTRY

In Kjeldahl’s method, which acid is used to digest the organic compound?

H₂SO₄ is used to digest the organic compound, converting nitrogen to (NH₄)2SO₄ in Kjeldahl’s method. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Chemistry Textbook - Latest Edition for Academic Session 2026-27 (Rationalized Textbook for Class XI and XII), Chapter: Chemical Bonding (Latest NCERT 2026-27), Topic: Hybridization of nitrogen in CH₃NH₂, sp³ hybridization and pyramidal geometry

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CHEMISTRY

In Kjeldahl’s method, which base is used to liberate ammonia from the digested sample?

NaOH is added to the digested sample ( (NH₄)2SO₄ ) to liberate NH₃, which is then distilled and titrated. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

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Isomerism - Stereoisomerism - Geometrical and Optical Isomerism

Which technique is least effective for separating a mixture of two liquids with boiling points of 110°C and 150°C, one o

Sublimation is for solids, not liquids. Simple distillation (40°C difference) or differential extraction (solubility) would work, but sublimation is irrelevant.

Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism

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Isomerism - Stereoisomerism - Geometrical and Optical Isomerism

In Kjeldahl’s method, 0.42 g of a compound produced ammonia that neutralized 15 mL of 0.2 M H₂SO₄. What is the percentag

Moles of H₂SO₄ = 0.015 × 0.2 = 0.003. Moles of NH₃ = 0.006 (2H per H₂SO₄). Mass of N = 0.006 × 14 = 0.084 g. Percentage = (0.084/0.42) × 100 = 20%.

Ref: NCERT Class 11 Chemistry > Chapter 8: Organic Chemistry - Some Basic Principles and Techniques > Topic: Isomerism - Stereoisomerism - Geometrical and Optical Isomerism

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