Coordination Compounds Board Exam Important Questions 2026: The Ultimate Guide
- Swarangi Nawge
- 4 days ago
- 3 min read
Preparing for the Coordination Compounds Board Exam Important Questions in 2026 requires a strategic approach. As the 2026 curriculum emphasizes competency-based learning, students must bridge the gap between theoretical bonding theories and their life-saving applications in the medical field.
Coordination chemistry is not just about complex formulas; it explains why blood is red (Hemoglobin) and how we treat critical illnesses (Cisplatin).
This blog provides a “Testbook-style” deep dive into the most repeated questions, essential formulas, and updated data verified for the 2026 academic session.
1. Chapter Overview and Weightage
In the Class 12 Board Exams, Coordination Compounds typically carry 7–9 marks. According to recent trends from official sample papers, the weightage is shifting toward:
Case-Based Questions (4 Marks):Usually focused on biological and medical importance
Short Answer (3 Marks):Hybridization and magnetic properties (VBT and CFT)
Very Short Answer (1–2 Marks):IUPAC nomenclature and isomerism
2. Essential Formulas & Concepts 2026
To solve Coordination Compounds Board Exam Important Questions accurately, you must master the following readable mathematical expressions.
Effective Atomic Number (EAN)
Although not always explicitly mentioned in NCERT, EAN is frequently used to explain the stability of metal carbonyls:
EAN = Z − (Oxidation State) + 2 × (Coordination Number)
Magnetic Moment (μ)
Used to determine whether a complex is paramagnetic or diamagnetic:
μ = √[n(n + 2)] Bohr Magnetons (B.M.)
Where n = number of unpaired electrons
Crystal Field Splitting Energy (CFSE)
For octahedral complexes:
CFSE = [ −0.4 × n(t₂g) + 0.6 × n(eᵍ) ] × Δ₀
3. High-Yield Topics: Most Repeated Questions
Based on an analysis of board papers from 2015–2025, the following are guaranteed question areas.
A. IUPAC Nomenclature
Naming coordination compounds is a staple in board exams. Practice these high-probability examples:
[Co(NH₃)₄(H₂O)Cl]Cl₂Name: Tetraammineaquachloridocobalt(III) chloride
K₃[Fe(CN)₆]Name: Potassium hexacyanoferrate(III)
[Ni(CO)₄]Name: Tetracarbonylnickel(0)
B. Bonding Theories (VBT vs CFT)
Board exams often ask comparative questions.
Example Question:Why is [Ni(CN)₄]²⁻ square planar and diamagnetic, while [NiCl₄]²⁻ is tetrahedral and paramagnetic?
Key Logic:
CN⁻ is a strong field ligand, causing electron pairing and dsp² hybridization
Cl⁻ is a weak field ligand, resulting in sp³ hybridization
C. Isomerism
Focus heavily on:
Linkage Isomerism (ligands like SCN⁻, NO₂⁻, CN⁻)
Optical Isomerism in bidentate complexes such as [Co(en)₃]³⁺
4. Medical Applications & Real-World Relevance 2026
In 2026, the “Application of Chemistry” section has expanded significantly. Below is updated data on the medical importance of coordination compounds:
Compound | Application |
Cisplatin [Pt(NH₃)₂Cl₂] | Most effective drug for treating solid tumors (chemotherapy) |
EDTA | Used in chelation therapy for lead (Pb) and arsenic poisoning |
Ca-EDTA | Removes heavy metals while maintaining calcium levels |
Auranofin | Gold coordination compound used in rheumatoid arthritis |
Gadolinium complexes | Contrast agents in MRI scans for enhanced imaging |
5. FAQs: Coordination Compounds Board Exam Important Questions
Q1. What is the most common mistake in Coordination Compounds Board Exam Important Questions?
Answer:Students often forget to include the oxidation state of the metal in Roman numerals during IUPAC naming. Another common mistake is misidentifying ambidentate ligands, such as NO₂⁻ versus ONO⁻.
Q2. How does the spectrochemical series affect the color of a complex?
Answer:The spectrochemical series determines the magnitude of Δ₀ (crystal field splitting energy). Stronger ligands cause greater splitting, leading to absorption of higher-energy (shorter wavelength) light. The observed color is the complementary color of the absorbed light.
Q3. Is Werner’s Theory still relevant for the 2026 Boards?
Answer:Yes. Questions related to Primary Valency (oxidation state) and Secondary Valency (coordination number) appear almost every year, especially in 1-mark questions.
Conclusion
Mastering the Coordination Compounds Board Exam Important Questions is the key to scoring full marks in Inorganic Chemistry. Focus on the relationship between ligand strength, hybridization, and magnetic properties, and do not ignore the medical relevance, as it is a major priority in the 2026 syllabus.
CTA
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