#aqueous solution

CHEMISTRY

How many ions are produced when [Co(NH₃)6]Cl₃ dissolves in water?

[Co(NH₃)6]Cl₃ dissociates into [Co(NH₃)6]^{3+ and 3 Cl^- ions, producing a total of 4 ions in solution. 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)Topic: Mole concept, atomic structure, chemical formulas like H₂O, CO₂, CH₃CH₂NH₂ and periodic trends.

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Reaction with Nitrous Acid and Diazonium Salts - Part 2

The weakest base among the following in aqueous solution is:

Aniline (C₆H₅NH₂) is the weakest base due to resonance delocalizing the nitrogen lone pair, reducing basicity, as per the PDF.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 2

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Reaction with Nitrous Acid and Diazonium Salts - Part 1

The weakest base among the following in aqueous solution is:

Aniline (C₆H₅NH₂) is the weakest due to resonance delocalizing the nitrogen lone pair, reducing basicity, as per the PDF.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1

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Reaction with Nitrous Acid and Diazonium Salts - Part 1

The weakest base in aqueous solution among the following is:

Aniline (C₆H₅NH₂) is the weakest due to resonance delocalizing the nitrogen lone pair, as per the PDF’s basicity discussion.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1

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Reaction with Nitrous Acid and Diazonium Salts - Part 1

Which amine has the lowest basicity in aqueous solution?

Aniline (C₆H₅NH₂) has the lowest basicity due to resonance delocalizing the nitrogen lone pair, as per the PDF’s basicity section.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Reaction with Nitrous Acid and Diazonium Salts - Part 1

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Chemical Reactions - Carbylamine Reaction and General Reactions

Which of the following amines has the highest basic strength in aqueous solution?

Basic strength depends on electron availability on nitrogen. (C₂H₅)₂NH (diethylamine) has two electron-donating ethyl groups and benefits from solvation effects, making it the strongest base among the options.

Ref: NCERT Class 12 Chemistry > Chapter 13: Amines > Topic: Chemical Reactions - Carbylamine Reaction and General Reactions

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Werner's Theory and Definitions - Ligands Coordination Number

What is the color of [Ti(H₂O)6]3+ in aqueous solution?

[Ti(H₂O)6]3+ (Ti₃+, d1) absorbs blue-green light (498 nm) due to t2g to eg transition, appearing violet (complementary color).

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number

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Lanthanoids - Electronic Configuration and Lanthanoid Contraction

Which of the following ions is colorless in aqueous solution?

Sc 3+ has no unpaired electrons (3d 0 ), so it does not exhibit d-d transitions.

Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Lanthanoids - Electronic Configuration and Lanthanoid Contraction

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Actinoids and Comparison of Lanthanoids and Actinoids

Which of the following transition metal ions is colorless in aqueous solution?

Sc 3+ has 3d 0 configuration with no d-d transitions possible.

Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: Actinoids and Comparison of Lanthanoids and Actinoids

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Colligative Properties - Relative Lowering and Elevation of Boiling Point

What is the mass of urea (molar mass = 60 g/mol) required to prepare 2 kg of a 0.5 molal aqueous solution?

Molality = (Moles of solute/Mass of solvent in kg) . Moles = 0.5 × 2 = 1 mol . Mass = 1 × 60 = 60 g .

Ref: NCERT Class 12 Chemistry > Chapter 1: Solutions > Topic: Colligative Properties - Relative Lowering and Elevation of Boiling Point

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Water and Mole Concept

What is the pH of a neutral aqueous solution at 25°C?

7 accurately defines or describes the concept asked in this question. Within Water and Mole Concept, precise definitions and terminology are essential for clear scientific communication. The other options (0, 14, and 10) either describe related but distinct concepts, use incorrect terminology, or confuse similar-sounding terms that have different scientific meanings. A thorough understanding of exact definitions helps distinguish between closely related biological concepts and is crucial for competitive examinations.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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Acid, Base, pH

Which of the following acids completely dissociates in aqueous solution?

HCl is the scientifically accurate answer to this question. Within the study of Acid, Base, pH, this concept is well-established through extensive research and is documented in standard scientific literature. The specific properties, mechanisms, or characteristics of HCl directly address what is being asked. Among the other options, CH₃COOH, H₂CO₃, and HF do not correctly answer this question because they either refer to different concepts, describe properties of other molecules or processes, or represent common misconceptions about this topic.

Ref: Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 2

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