Chemistry is one of the most important subjects for Class 12 students especially for those preparing for board exams and competitive entrance tests. Understanding key concepts and mastering very very important (VVI) subjective questions can help students achieve high marks.
In this topic we will cover some of the most important subjective questions from different chapters of Class 12 Chemistry. These questions will help students revise important topics and enhance their answer-writing skills.
Why Are Subjective Questions Important?
Subjective questions require students to explain concepts in detail provide examples and show step-by-step calculations where needed. They help in:
- Developing a deeper understanding of chemistry concepts
- Improving answer presentation skills for board exams
- Strengthening conceptual clarity for competitive exams like JEE and NEET
- Enhancing problem-solving skills in numerical-based topics
Now let’s explore some of the most important VVI subjective questions chapter-wise.
Important Subjective Questions for Class 12 Chemistry
1. Solid State
- Explain the difference between crystalline and amorphous solids with examples.
- Derive Bragg’s equation and explain its significance in X-ray diffraction studies.
- Discuss the types of unit cells in a crystal lattice with diagrams.
2. Solutions
- Define Raoult’s Law and explain its applications in real-life solutions.
- Explain the concept of colligative properties and their dependence on solute ptopics.
- Derive the equation for elevation in boiling point and its relation to molality.
3. Electrochemistry
- Explain the working of a galvanic cell with an example.
- Derive Nernst equation and discuss its application in determining electrode potential.
- What is electrochemical series? How does it help in predicting the feasibility of a redox reaction?
4. Chemical Kinetics
- Derive the equation for the rate constant of a first-order reaction.
- Explain the Arrhenius equation and its significance in reaction kinetics.
- Define order of reaction and explain how it is determined experimentally.
5. Surface Chemistry
- Differentiate between physisorption and chemisorption with suitable examples.
- Explain the role of catalysts in chemical reactions with reference to heterogeneous catalysis.
- What are colloids? Discuss their classification based on the nature of the dispersed phase and dispersion medium.
6. General Principles and Processes of Isolation of Elements
- Explain the froth flotation process used in metallurgy.
- Discuss the thermodynamic principles involved in the extraction of metals.
- What is the role of Ellingham diagrams in metallurgy?
7. The p-Block Elements
- Explain the allotropic forms of phosphorus with their structures.
- Discuss the anomalous behavior of oxygen compared to other Group 16 elements.
- What are interhalogen compounds? Give examples and discuss their properties.
8. The d- and f-Block Elements
- Why do transition elements exhibit variable oxidation states? Explain with examples.
- Discuss the magnetic properties of transition metals based on their electronic configuration.
- What are lanthanide contraction and its consequences?
9. Coordination Compounds
- Explain Werner’s theory of coordination compounds with suitable examples.
- What is crystal field theory? Explain the difference between octahedral and tetrahedral splitting.
- Write the IUPAC names and draw the structures of the following coordination compounds:
- [Fe(CN)₆]³⁻
- [Co(NH₃)₆]³⁺
- [Ni(CO)₄]
10. Haloalkanes and Haloarenes
- Explain the mechanism of nucleophilic substitution reactions (SN1 and SN2).
- Discuss the difference between haloalkanes and haloarenes with examples.
- How do the physical properties of haloalkanes depend on molecular mass and bonding?
11. Alcohols Phenols and Ethers
- Explain the acidic nature of phenols and compare them with alcohols.
- Write the mechanism of dehydration of alcohols to form alkenes.
- Discuss the preparation of ethers by Williamson synthesis.
12. Aldehydes Ketones and Carboxylic Acids
- Explain the mechanism of nucleophilic addition reactions in aldehydes and ketones.
- Compare the acidity of carboxylic acids and alcohols.
- What is the Haloform reaction? Explain with an example.
13. Organic Compounds Containing Nitrogen
- Explain the preparation of amines by Hoffmann bromamide reaction.
- Discuss the basic strength of amines in gaseous and aqueous phases.
- What are diazonium salts? Discuss their importance in organic synthesis.
14. Biomolecules
- Explain the structure and functions of proteins and nucleic acids.
- What are enzymes? Discuss their role as biocatalysts.
- Differentiate between DNA and RNA in terms of structure and function.
15. Polymers
- What are addition and condensation polymers? Give examples.
- Discuss the properties and applications of Bakelite and Nylon-66.
- Explain the significance of biodegradable polymers in environmental conservation.
16. Chemistry in Everyday Life
- Explain the role of antibiotics and analgesics in medicine.
- What are synthetic detergents? How do they differ from soaps?
- Discuss the use of food preservatives and artificial sweeteners in the food industry.
Tips to Answer Subjective Questions Effectively
- Understand the Concept – Focus on the logic behind the topic instead of rote memorization.
- Write Clear and Concise Answers – Avoid unnecessary details and keep your answers to the point.
- Use Diagrams and Equations – Where applicable include labeled diagrams and chemical equations to enhance clarity.
- Highlight Keywords – Underline or bold important terms to make your answer more structured.
- Practice Regularly – Solve previous years’ board exam papers and sample questions to improve your confidence.
Mastering VVI subjective questions in Class 12 Chemistry is essential for scoring well in board exams and entrance tests. By focusing on key topics practicing important questions and improving answer-writing techniques students can achieve high marks and build a strong foundation for future studies in chemistry.
Regular revision concept clarity and effective presentation of answers will help students succeed in this challenging yet rewarding subject.
