CBSE Class 12 Chemistry Viva Questions 2025

Overview: This article is the ultimate guide to preparing for the CBSE Class 12 Chemistry Viva Questions 2025, curated to make your Viva experience less daunting and more fruitful.

The CBSE Class 12 Chemistry practical exam involves hands-on experiments and a Viva Voce session. While the former assesses your experimental skills, the latter tests your understanding of chemical principles and concepts.

Due to its unpredictability, the Viva can often be intimidating. However, thorough preparation can make this experience easy to conquer. 

This article provides a well-rounded preparation strategy and sample CBSE Class 12 Chemistry Viva Questions for 2025.

Download Free Study Materials for CBSE Class 12th by SuperGrads

CBSE Class 12 Chemistry Viva Questions

The total marks for CBSE Class 12 Chemistry Practical are 30, divided into different components, including experiments, project work, and practical file records. Students must secure at least 10 marks in the practical to pass the subject.

Students are required to attend the practical exam on the designated date. It will be held exclusively in schools, and an external examiner will preside over it.

CBSE Class 12 Chemistry Viva Questions Mark Distribution

Topic	Marks Distribution
Experiment 1 (on Volumetric Analysis)	8
Experiment 2 (on Salt Analysis)	8
Experiment 3 (Based on Content)	6
Investigatory Project	4
Class Record and Viva-Voce	4
Total Marks	30

Check Out: How to score 100 in Chemistry Class 12 CBSE

CBSE Class 12 Chemistry Viva Questions 2025 Preparation

Here is the prep plan for CBSE Class 12 Chemistry Viva Questions 2025. 

• Understand the Syllabus: The first step is to know what topics you could be quizzed on. Familiarise yourself with the syllabus.
• Revisit Laboratory Experiments: Understand the purpose, principle, and procedure of each experiment you have performed during the academic year.
• Theoretical Preparation: Strengthen your basics by revising core chemical concepts and theories.
• Mock Viva: Simulate Viva situations with friends. This helps you think on your feet.
• Consult Teachers: Interact with your teachers to know the type of questions that are commonly asked.
• Review Past Questions: Review Viva questions asked in previous years if available.
• Body Language: Work on maintaining a composed and confident demeanour.

cbse-class-12-chemistry-viva-questions

Sample CBSE Class 12 Chemistry Viva Questions for 2025

Q1: What is qualitative analysis? 

Ans: The type of analysis that deals with the methods used to determine a compound's constituents. 

Q2: What is a radical? 

Ans: A radical may be defined as an atom or group of atoms carrying a charge and behaving as a single chemical reaction unit. 

Check Out: CBSE Class 12 Applied Mathematics

Sample Questions for CBSE Class 12 Chemistry by SuperGrads

Q3: What are acidic and basic radicals? 

Ans: A salt consists of two parts known as radicals. The positively charged part of a salt (Cation), which has been derived from a base, is known as a basic radical. 

The negatively charged part of the salt (anion) that has been derived from an acid is known as an acidic radical. 

Q4: Why do inorganic salts ionise when dissolved in water?

Ans: Due to the high dielectric constant of water, the force of attraction holding the two ions in a salt decreases; thus, the two ions separate. 

Q5: What is the colour of iron salts? 

Ans: Ferrous salts are usually light green. 

Check Out: CBSE class 12 Chemistry Tips and Tricks

Q6: What is the colour of nickel salts? 

Ans: Bluish green or green. 

Q7: What is sublimation? 

Ans: It is the process by which a salt directly changes into a gaseous phase without melting. 

Q8: Name the radical that produces carbon dioxide on heating. 

Ans: Carbonate

Check Out: CBSE 2023 Toppers Talk

Q9: What is aqua regia? 

Ans: Aqua regia is a mixture of conc. HCI and conc. HNO3 in ratio 3:1

Q10: What is the flame test? 

Ans: The flame test is a test for detecting the presence of certain metals in compounds by the colouration they give to a flame. 

Q11: Why is platinum metal preferred to other metals for the flame test? 

Ans: Because platinum does not react with acids and does not self-impart any characteristic colour to the flame. 

Check Out: CBSE Chemistry Class 12 Syllabus

Q12: Name the acid radicals detected with dil. Sulphuric acid? 

Ans: Sulphide ion & Carbonate ion. 

Q13: What is Tollen's reagent? 

Ans: The Ammonical AgNO3 solution is called Tollen's reagent. 

Q14: What is a standard solution? 

Ans: A solution whose strength is known is called a standard solution. 

Check Out: CBSE class 12 Chemistry Reference books

Q15: What is titration? 

Ans: Titration is the process of adding one solution from the burette to another in the conical flask to complete the chemical reaction involved. 

Download PYPs with Solutions for CBSE Class 12 Chemistry

Key Takeaways

• The Viva Voce in the Class 12 Chemistry practical exam is not just an evaluation but an opportunity to demonstrate conceptual clarity and build confidence.
• Following the preparation plan outlined in this article and practising the sample questions will help you face the Viva easily and confidently.

Mastering your CBSE Class 12 Chemistry Viva Questions 2025 preparation with this article will bring you one step closer to excelling in your CBSE Class 12 Chemistry practical exams. Good luck!