Class 12 Chemistry Previous Year Question Paper 2025 (Set – 1 & 2) with Solutions

CBSE Students who are preparing for upcoming 12th chemistry exam must practice this class 12 chemistry solved PYQ 2025. This will be very helpful for students in their exam preparation. Students can understand the exam pattern, question difficulty and also can do self analysis with the help of this PYQ.

We have also given solutions of each question so that student can cross check their answer. Practising Class 12 chemistry Previous Year Question papers 2025 before exam can boost confidence in students and students can score better marks in exam. Different set of PYQ has given in this post and CBSE experts have prepared solutions of this PYQ.

Class 12 chemistry PYQ 2025 SET 1 Question
Class 12 chemistry PYQ 2025 SET 1 Solution
Class 12 chemistry PYQ 2025 SET 2 Question
Class 12 chemistry PYQ 2025 SET 2 Solution

Class 12 Chemistry PYQ 2025 SET 1 Question

Class 12 Chemistry PYQ 2025 SET 1 Solution

Class 12 Chemistry PYQ 2025 SET 2 Question

Class 12 Chemistry PYQ 2025 SET 2 Solution

Class 12 Chemistry PYQ 2019
Class 12 Chemistry PYQ 2026

CBSE exam is usually held between feb and April every year. And for many students, this exam decides their career specially who want to pursue a career in Chemistry. Practising only chapter is not enough for scoring good marks in exam. Solving Class 12 Chemistry PYQs is also important.

We hope students found this class 12 chemistry solved PYQ 2025 helpful for them. Keep learning if you have any questions you can ask in comment section. Also you can also help your friend by sharing this post to them

Important Question of Class 12 Chemisty PYQ 2025

Question :

17. (A) Give reasons :

(a) Cooking is faster in pressure cooker than in an open pan.

(b) On mixing liquid X and liquid Y, volume of the resulting solution decreases. What type of deviation from Raoult’s law is shown by the resulting solution? What change in temperature would you observe after mixing liquids X and Y?

OR

(B) Define Azeotrope. What type of Azeotrope is formed by negative deviation from Raoult’s law? Give an example.

Solution :

(A)

(a) Due to high pressure inside the pressure cooker, higher is the boiling point and faster is the cooking.

(b)
Negative deviation
Temperature increases.

OR

(B)
Same composition in liquid and in vapour phase and boil at a constant temperature.
Maximum Boiling Azeotrope
68% HNO₃ + 32% H₂O (Or any other correct example) (Percentage can be ignored

Question :

25. Define the following terms :

(a) Anomers

(b) Invert sugar

(c) Glycosidic linkage

Solution :

(a) Isomers which differ in the configuration of -OH at C-1 or C-2 of monosaccharides.

(b) Sucrose is dextrorotatory and its hydrolysis gives dextrorotatory glucose and laevorotatory fructose where laevo rotation is more than dextro rotation resulting in net rotation as laevorotatory, the product is known as invert sugar.

(c) Glycosidic linkage in which two or more monosaccharides are joined together by an oxygen atom.

Question :

For the first order thermal decomposition reaction, following data was obtained

Calculate rate constant

Solution :