PSEB Class 12 Chemistry Question Paper 2025 with Answer Key, Download PDF

The PSEB Class 12 Chemistry exam plays a crucial role in a student’s academic journey, testing their understanding of key concepts in physical, organic, and inorganic chemistry. The paper follows the latest syllabus and exam pattern prescribed by the board, ensuring a balanced mix of theoretical and numerical questions.

After the exam, students eagerly await the answer key to cross-check their responses and estimate their scores. The availability of the question paper and answer key in PDF format allows students to analyze their strengths and weaknesses, helping them prepare better for upcoming exams. Stay tuned for detailed question paper analysis and expert reviews.

PSEB Class 12 Chemistry Question Paper 2025

PSEB Class 12 Chemistry Question Paper 2025 Download PDF

PSEB Class 12 Chemistry Answer Key 2025

(i) Give full form of DNA and RNA.

Answer:

• DNA: Deoxyribonucleic Acid

• RNA: Ribonucleic Acid

(ii) How many types of RNA are there?

Answer:
There are three types of RNA:

1. Messenger RNA (mRNA) – Carries genetic information from DNA to ribosomes.

2. Ribosomal RNA (rRNA) – Forms the structural and functional component of ribosomes.

3. Transfer RNA (tRNA) – Helps in protein synthesis by carrying amino acids.

(iii) Who is responsible for heredity?

Answer:
Heredity is controlled by chromosomes, which are made up of DNA. DNA carries genetic information and determines inherited traits.

(iv) Define heredity.

Answer:
Heredity is the process of passing genetic traits from parents to offspring through DNA.

(v) How many types of nucleic acids are there?

Answer:
There are two types of nucleic acids:

1. Deoxyribonucleic Acid (DNA)

2. Ribonucleic Acid (RNA)

True / False

(vi) CO is a stronger ligand than Cl⁻.

Answer: True

(vii) The color produced in Victor Meyer test for primary alcohol is deep blue.

Answer: False

(viii) Formic acid is obtained from red ants.

Answer: True

(ix) IUPAC name of Acetone is Butanone.

Answer: False

(x) Ni(CO)₄ is diamagnetic.

Answer: True

Multiple Choice Questions:

(xi) The units of ebullioscopic constant is:

Answer: (b) mol kg⁻¹ K

(xii) Galvanisation is applying a coating of:

Answer: (c) Zn (Zinc)

(xiii) The units of first-order reaction:

Answer: (a) s⁻¹

(xiv) What is the mole fraction of benzene in solution containing 30% by mass in carbon tetrachloride?

Answer: (b) 0.459

(xv) The porous membrane used in reverse osmosis plant is made up of:

Answer: (a) Cellulose acetate

(xvi) What is DDT among the following?

Answer: (c) Non-Biodegradable Pollutant

(xvii) In the following, strongest acid is:

Answer: (b) CH₃COOH (Acetic Acid)

(xviii) Benzoic Acid reacts with LiAlH₄ to give:

Answer: (d) Benzyl Alcohol

(xix) Vinegar is a dilute aqueous solution of:

Answer: (a) Ethanoic acid (Acetic acid)

(xx) The oxidation state of Fe in [Fe(CN)₆]⁻³:

Answer: (a) +3

PSEB Class 12 Chemistry Answer Key 2025 will be provided soon...