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CBSE Class 12 Chemistry Question Bank with Important Questions – Solutions Raoult’s Law 2026

  • 23 hours ago
  • 4 min read

Updated: 22 hours ago


CBSE Class 12 Chemistry Question Bank 2026 cover with red and black text. Includes molecule diagram and triangular corner designs.


Mastering Solutions: CBSE Class 12 Chemistry Question Bank 2026 for Raoult’s Law



For students aiming to ace their 2026 board exams, mastering the "Solutions" chapter is a non-negotiable step. As per the latest weightage released by the board, this unit holds a significant 7 marks, focusing heavily on theoretical concepts and numerical applications of vapor pressure. This CBSE Class 12 Chemistry Question Bank 2026 is designed to provide you with a structured approach to Raoult’s Law, ensuring you can tackle everything from 1-mark MCQs to complex case-study questions.


Whether you are preparing for the CBSE boards or looking for HSC OCM and Official Links for Maharashtra Board Question Banks, this guide bridges the gap between basic theory and exam-level proficiency.


Core Concepts of Raoult’s Law



Raoult’s Law serves as the backbone of physical chemistry in the Class 12 syllabus. It explains how the vapor pressure of a solvent changes when a solute is added. To understand this, we categorize solutions into two types:


  1. Volatile Solutes: Where both components contribute to the total vapor pressure.


  2. Non-Volatile Solutes: Where only the solvent contributes to the vapor pressure, leading to a "lowering" effect.


The Fundamental Formulas



While preparing from the CBSE Class 12 Chemistry Question Bank 2026, you must memorize the following formula names and their applications:


  • Partial Vapor Pressure Formula (For volatile components)


  • Total Vapor Pressure Equation (Dalton’s Law application)


  • Relative Lowering of Vapor Pressure (Colligative property)


  • Mole Fraction in Vapor Phase



Important Questions: Solutions Raoult’s Law 2026



Analysis of the last five years of papers shows that nearly 40% of the questions from this chapter revolve around Raoult’s Law and its deviations. Here are the high-probability questions curated for your 2026 preparation.


1. Very Short Answer Questions (1 Mark)


  • Define an ideal solution in terms of Raoult’s Law.


  • Why does the vapor pressure of a liquid decrease when a non-volatile solute is added?


  • Identify the dimensionless quantity among Molarity, Molality, and Mole Fraction.


2. Short Answer Questions (2–3 Marks)


  • Comparison Task: Distinguish between Positive and Negative deviations from Raoult’s Law with examples like Ethanol-Water and Acetone-Chloroform.


  • Graphical Analysis: Sketch the vapor pressure vs. mole fraction graph for an ideal binary solution.


  • Medical Relevance: Explain how the principle of gas solubility (Henry's Law) and vapor pressure is vital in medical scenarios such as "Anoxia" at high altitudes.


3. Numerical Problems


The 2026 exam pattern emphasizes Competency-Based Questions (50%). You should practice:


  • Calculating the total vapor pressure of a mixture given the vapor pressures of pure components.


  • Finding the mole fraction of a solute when the relative lowering of vapor pressure is provided.


  • Determining the molar mass of an unknown non-volatile solute using vapor pressure data.


Maharashtra Board Question Bank (HSC 2026)



If you are a student under the Maharashtra State Board of Secondary and Higher Secondary Education (MSBSHSE), your preparation should also include the official "Prashnapedhi." The state council releases these banks to help students familiarize themselves with the Marathi and English medium paper patterns.


Official Resources and Links





Why Raoult’s Law Matters in Medicine



Understanding solutions is not just for passing exams; it is foundational for future medical professionals.


  • Intravenous (IV) Fluids: The tonicity and vapor pressure of solutions are critical when preparing saline or glucose drips to ensure they are isotonic with human blood.


  • Anesthesia: The solubility of anesthetic gases in the blood is governed by principles closely related to Raoult’s and Henry’s Laws.


  • Pharmacy: Drug formulation involves maintaining the stability of a solution, which depends on understanding the vapor pressure of volatile medicinal components.


Conclusion



The "Solutions" chapter is a scoring goldmine if you understand the logic behind vapor pressure. By utilizing this CBSE Class 12 Chemistry Question Bank 2026, you align your study plan with the latest marking schemes and competency requirements. Focus on the relationship between mole fractions and pressure, practice the graphical representations, and don't forget to check the official links for additional practice.



FAQ: CBSE Class 12 Chemistry Question Bank 2026



Q1: How can I download the official CBSE Class 12 Chemistry Question Bank 2026? 


A1: You can download the official question bank and sample papers directly from the CBSE academic website. Additionally, refer to SCERT portals for state-specific question banks that often cover similar important questions.


Q2: Is Raoult’s Law applicable to all types of solutions? 


A2: No, Raoult's Law is strictly applicable only to ideal solutions. Real solutions often show positive or negative deviations based on the strength of intermolecular forces between the solute and solvent.


Q3: Which is more important for the 2026 exam: Henry’s Law or Raoult’s Law? 


A3: Both are crucial. Henry’s Law usually appears in 1 or 2-mark conceptual questions (like the "soda bottle" or "scuba diver" problems), while Raoult's Law is the basis for 3-mark numericals and long-form questions on colligative properties.


Q4: What are the best resources for practicing the CBSE Class 12 Chemistry Question Bank 2026? 


A4: Use NCERT Exemplar, previous year's board papers (2020-2025), and official state board question banks from portals like maa.ac.in.


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