12th HSC Solution Previous Year Questions
The Solutions chapter (2nd Chapter) of Class 12 HSC Chemistry is a scoring topic in the Maharashtra Board syllabus. Questions from this chapter appear consistently every year in the HSC board exam.
Class 12 HSC Chemistry Chapter 2 – Solutions | Important Questions 2025
Class 12 HSC Chemistry – Chapter 2: Solutions (Important Questions for 2025 Board Exam)
Chapter 2: Solutions is a crucial part of the Maharashtra HSC Class 12 Chemistry syllabus. It deals with concepts like molarity, colligative properties, and Raoult’s Law, which are commonly tested in board exams. To help you score higher, we've compiled the most important questions you must revise before the 2025 HSC Chemistry board exam.
📘 Conceptual Questions
- Explain Raoult’s Law with a suitable example. How does it apply to ideal solutions?
- Define mole fraction. How is it different from molarity and molality?
- What are azeotropes? Explain the types with examples.
- Differentiate between ideal and non-ideal solutions using vapor pressure diagrams.
- State the conditions for an ideal solution. Give an example and explain.
🧪 Numerical Problems (With Application)
- A solution contains 5 g of NaCl dissolved in 500 g of water. Calculate its molality.
- Find the depression in freezing point when 18 g of glucose (C₆H₁₂O₆) is dissolved in 100 g of water. (Kf = 1.86 K kg/mol)
- Calculate the relative lowering of vapor pressure when 50 g of urea is dissolved in 850 g of water at 300 K.
- Determine the elevation in boiling point when 2 g of a solute is added to 100 g of water. (Kb = 0.512 K kg/mol)
- A solution freezes at -0.93°C. Calculate the molar mass of the solute. (Assume Kf = 1.86 K kg/mol)
💡 Application-Based Questions
- Why do we add salt to ice in freezing mixtures? Explain the colligative principle involved.
- Describe the use of colligative properties in determining the molar mass of a solute.
- What is reverse osmosis? How does it differ from simple osmosis in terms of pressure and solute movement?
📝 Quick Preparation Tips for Chapter 2
- Focus on the definitions and laws – Raoult’s Law, Henry’s Law, and colligative properties are often directly asked.
- Draw neat diagrams for vapor pressure vs. mole fraction, boiling point elevation, and freezing point depression.
- Revise solved numericals from your textbook and practice 4–5 additional board-style numericals.
- Memorize all units and formulas – especially for molality, molarity, and % concentration.
- Create a concept map summarizing the chapter on a single A4 sheet for last-minute revision.
📌 Conclusion
Chapter 2 – Solutions can earn you 7 to 10 marks if prepared thoroughly. Focus on concept clarity, problem-solving, and understanding real-life applications. Use this question set as a benchmark to evaluate your preparation level. Stay consistent and keep practicing!
For more exam-focused content and free study notes, visit: AgastyaClasses.in
Class 12 Chemistry Chapter 2
- Previous year questions from 2015–2024
- Solved answers
- Important formulas
- Tips to score full marks
Maharashtra Board Chemistry
Chapter Overview: Important Concept to Focus On
Here are the key concepts you must understand from Chapter 2 – Solutions:
Concept Expected Weightage
Types of solutions 1–2 marks
Concentration terms (molality, molarity, mole fraction) 2–3 marks
Raoult’s law and ideal/non-ideal solutions 2–4 marks
Colligative properties 3–4 marks
Van’t Hoff factor & abnormal molar mass 2–3 marks
Previous Year Questions – Chapter 2 (Solutions)
Important questions from the solution chapter, Chemistry 12th HSC
Q1. Define mole fraction and write its formula. (2 Mark) (2022)
Q.2.Derive the formula for depression in freezing point.(3Mark) (2023)
Q.3.Explain Raoult’s law for a binary solution.(3Mark) (2020)
Q. 4. What is the Van’t Hoff factor? How does it explain abnormal molar mass?(3Mark) (2021)
Q.5.State and explain Henry’s law.(3 Mark)(2019)
For more questions, please download the following PDF
HSC Chemistry Solutions Chapter
Expert Tips to Score Full Marks
- Focus on derivations – Always write formulas with units
- Solve numericals regularly – Practice 10+ past paper sums
- Create flashcards – For definitions and laws
- Revise daily – 15-minute micro-revisions help retain formulas
- Attempt mock tests – Mimic board exam conditions
Frequently asked questions
Q1: Is the Solutions chapter important for the HSC exam?
Yes, it carries 7–9 marks and appears every year.
Q2: Are numericals from colligative properties frequently asked?
Absolutely. 2–3 numericals appear in most board exams.
Q3: Can I skip derivations?
Not recommended. Derivations are high-weightage and often repeated.
Q4: Which law is most repeated in exams?
Raoult’s Law and Henry’s Law are asked about almost every year.
If you're a 12th HSC student, mastering the Solutions chapter is a must. Go through previous year questions, understand the derivations, and practice numericals daily. Download the question bank PDF and stay consistent. Remember — clarity + practice = top score!
