CBSE Board Exam 2025: Check Important Questions For Chemistry

CBSE Board Exams 2025: The Central Board of Secondary Education (CBSE) conducts the Class 10 and 12 board exams for the 2025 academic year. The Class 10 exams began with English, while the Class 12 exams began with Entrepreneurship. The Chemistry exam for Class 12 is scheduled for February 27, 2025. Students can visit the official CBSE website to check the sample paper.

By practicing these CBSE Class 12 Chemistry sample papers, students can enhance their problem-solving skills and gain confidence in their knowledge. Detailed solutions are provided with each sample paper, providing step-by-step explanations that help clarify complex topics and reinforce learning. This free PDF resource allows you to study effectively and be fully prepared for your upcoming exams

Here are some important questions from the sample papers:

CBSE Class 12 Chemistry Sample Paper Questions

1️⃣ Raoult’s Law & Deviation

🔹 What kind of deviation from Raoult's law is expected when phenol and aniline are mixed? What change in the net volume of the mixture is expected? Represent the deviation graphically

2️⃣ Vapour Pressure Calculation

📍 The vapour pressure of pure water at a certain temperature is 23.80 mm Hg. If 1 mole of non-volatile non-electrolytic solute is dissolved in 100 g of water, calculate the resulting vapor pressure of the solution

3️⃣ Radioactive Decay & Half-Life Concept

🧪Radioactive decay follows first-order kinetics.
🧪 The initial amount of two radioactive elements X and Y is 1 gram
🧪 Question: What will be the ratio of X and Y after two days if their half-lives are 12 hours and 16 hours respectively?

4️⃣ Second Ionization Enthalpy of Mn & Cr

📌 The second ionization enthalpy of chromium and manganese is 1592 and 1509 kJ/mol respectively. Explain the following value of Mn

5️⃣ Corrosion Protection: Ni vs. Zn as Sacrificial Electrodes

🔹 In order to protect iron from corrosion, which one will you prefer as a sacrificial electrode, Ni or Zn? Why? (Given standard electrode potentials of Ni, Fe and Zn are -0.25 V, -0.44 V and -0.76 V respectively)

6️⃣ Electrophilic Substitution in Haloarenes vs. Benzene

📍 Explain why electrophilic substitution reactions in haloarenes proceed slowly and require more stringent conditions than in benzene

7️⃣ Acetone & 2,4-DNP Reagent Reaction

🔬 Question: Explain why electrophilic substitution reactions in haloarenes proceed slowly and require more stringent conditions than in benzene

Chemistry Sample Papers 2025 

Preparing for CBSE board exams 2025 can be challenging, and having the right tools is vital for success. Our CBSE Class 12 Chemistry sample papers are designed to give you a comprehensive understanding of the exam format, types of questions, and key concepts as per the latest Class 12 Chemistry syllabus.

Read more: CBSE 2025 Board Exam Preparation: Last-Minute tips to Score High