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#coordination compounds

41 public questions tagged with this topic.

CHEMISTRY

What is the magnetic moment (in BM) of [CoClâ‚„]^{2- ?

Given: What is the magnetic moment (in BM) of [CoCl₄]^{2- ? These values define the system as per NCERT data. Formula: Magnetic moment = sqrt3(3+2) = sqrt15 approx 3.87 BM.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Co²⁺ ( d⁷ ) in tetrahedral [CoCl₄]^{2- with weak field Cl^- is high spin ( e⁴ t_2³ ), with 3 unpaired electrons. 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

What is the formula of tetraamminediaquacobalt(III) chloride?

Co³⁺ with 4 NH₃ and 2 H₂O (neutral) forms [Co(NH₃)4(H₂O)2]^{3+, balanced by 3 Cl^-, giving [Co(NH₃)4(H₂O)2]Cl₃ . This follows from NCERT principle where relation explains outcome clearly for students.

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

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CHEMISTRY

What is the formula for hexaamminecobalt(III) sulphate?

Co³⁺ with 6 NH₃ forms [Co(NH₃)6]^{3+ . Sulphate ( SO₄^{2- ) requires 3 units to balance two +3 complexes, giving [Co(NH₃)6]2(SO₄)3 . 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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CHEMISTRY

What is the color of [CoCl(NH₃)5]^{2+ in aqueous solution?

[CoCl(NH₃)5]^{2+ absorbs yellow light due to d-d transitions, appearing violet, the complementary color. 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

What is the color of [Ti(Hâ‚‚O)6]^{3+ in aqueous solution?

Given: What is the color of [Ti(H₂O)6]^{3+ in aqueous solution? These values define the system as per NCERT data. Formula: [Ti(H₂O)6]^{3+ (Ti³⁺, d¹ ) absorbs blue-green light due to t_{2g to e_g transition, appearing violet, the complementary color.. This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Substituting values like 1.2 × 10⁻⁵, 236 J kg⁻¹ K⁻¹, CH₃CH₂NH₂ etc. into the formula and simplifying step by step. 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: Solutions, Topic: Concentration terms and colligative properties.

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CHEMISTRY

Which of the following ions is colored due to d-d transitions?

Ni^{2+ (Z = 28): 3d⁸ . Partially filled d orbitals allow d-d transitions, causing a green color in aqueous 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), Chapter: Coordination Compounds and d Block Elements (Latest NCERT 2026-27), Topic: Colour of [Ti(H₂O)₆]³⁺, crystal field theory and d-d transition

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