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Punjab (PTB) · 2nd Year Chemistry paper scheme (Punjab boards) · Free

2nd Year Chemistry Board Pattern Paper 2026

85 marks · 3 hours · 55 questions. Covers: 17 chapters (CHAP 17: GROUP 2 ELEMENTS to CHAP 33: WATER).

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2nd Year Chemistry Board Pattern Paper 2026

2nd Year · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 85Time: 3 hours

Q1. Multiple choice questions (Attempt all · 17 × 1 = 17)

  1. If a complex ion is represented as [Co(NH3)5Cl]n, where Cobalt is in the +3 oxidation state, what is the value of n?

    1. +3

    2. +2

    3. +1

    4. -2

  2. Which level of water treatment is specifically responsible for the removal of physical debris?

    1. Primary treatment

    2. Secondary treatment

    3. Tertiary treatment

    4. Advanced treatment

  3. Penicillin kills bacterial strains by targeting the enzyme:

    1. Carbonic anhydrase

    2. Succinate dehydrogenase

    3. Trans-peptidase

    4. Amylase

  4. The average atomic mass of Ne having isotopes , with natural abundance is:

    1. 20.50 amu

    2. 20.18 amu

    3. 30.70 amu

    4. 20.00 amu

  5. When the C-H bond breaks during the restoration of aromaticity, the cleavage is:

    1. Homolytic

    2. Heterolytic

    3. Photolytic

    4. Thermal

  6. Which of the following is explicitly mentioned as a factor affecting reactivity alongside bond energy?

    1. Boiling point

    2. Surface area

    3. Bond polarity

    4. Molecular geometry

  7. Chromatography can be used to separate:

    1. Only coloured substances

    2. Only colourless substances

    3. Both coloured and colourless substances

    4. Neither coloured nor colourless substances

  8. During Fehling's test, Cu2+ ions are reduced to which state?

    1. Metallic copper

    2. Cu1+ ions

    3. Cu3+ ions

    4. Complex copper salt

  9. In drug development, designers employ XRD to realize how a drug molecule:

    1. Dissolves in liquids

    2. Attaches to its target

    3. Is packed into tablets

    4. Changes its chemical color

  10. What was unique about the structure of the molecule picked out by the computer model?

    1. It was exactly identical to penicillin

    2. It lacked any functional groups or heteroatoms.

    3. It possessed a molecular structure different from existing antibiotics.

    4. It was an inorganic metal complex.

  11. Polymers designed for blood vessels must exhibit high ........, while those for bones must exhibit high .......:

    1. Transparency, elasticity

    2. Flexibility, strength

    3. Hardness, transparency

    4. Solubility, density

  12. Compared to Group 1 metals, Group 2 metals exhibit:

    1. Higher hardness and higher density

    2. Lower hardness and lower density

    3. Lower boiling points and higher solubility

    4. Softness allowing knife cutting and lower melting points

  13. Deuterated solvents are used in to:

    1. Increase magnet strength

    2. Split the signals

    3. Provide a reference signal

    4. Avoid solvent signal interference

  14. Which one of the following does not represent an oxidation?

    1. Ethanal  ethanol

    2. Propan-1-ol propanal

    3. Propan-2-ol propanone

    4. Ethanol  ethanoic acid

  15. What by-product is released during the alkylation of methanamine with bromoethane?

    1. H2O

    2. HBr

    3. HCI

    4. NH3

  16. Chirality is also commonly referred to as:

    1. Handedness

    2. Polarity

    3. Isomerism

    4. Symmetry

  17. Which two gases primarily cause acid rain when released into the atmosphere?

    1. Carbon dioxide and Oxygen

    2. Sulphur oxides and Nitrogen oxides

    3. Hydrogen and Helium

    4. Ammonia and Methane

Q2. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. Draw the structure of the following: 3-methylpentanal

  2. Why is the E2 reaction called bimolecular?

  3. How is C-1 assigned in disubstituted benzene?

  4. Why do transition elements form colored complexes/ions?

  5. Why do Group 2 metals conduct electricity better than Group 1 metals?

  6. 4-methylaniline reacts with HNO2(aq) at 4oC to form compound P. Compound P reacts with NaOH. The product of this reaction is compound Q. Draw the structure of compound P and Q.

  7. What is thalidomide?

  8. Explain the mechanisms which the chloroalkane will adopt while giving nucleophilic substitution reactions.

  9. Why is -COOH given higher priority than -OH?

  10. What is the role of a ligand in forming a complex ion, and what type of bond is formed?

  11. Why does solubility of Group 2 hydroxides increase in terms of the relative changes in Hohyd and Holattice?

  12. Define a tertiary (3o) alcohol

Q3. Short questions (Attempt any 8 of 12 · 8 × 2 = 16)

  1. Write the balanced equation for the reaction of aniline with bromine water.

  2. What is a "Target Molecule" (TM)?

  3. What tool is used to apply the sample spot onto the baseline of a TLC plate?

  4. For poly(chloroethene) (PVC): Name the monomer.

  5. Describe a test (a different one in each case) that you could use to distinguish between the following pair of compounds: CH2=CH-CH2-OH and CH3CH2CHO

  6. Point out the main structural difference between the compounds in each of the following pairs. Glycolipids and lipoproteins

  7. Explain why glycine is the only standard amino acid that does not exhibit optical activity.

  8. What target organism was chosen to train the machine-learning algorithm to recognize antibacterial traits?

  9. What does the abbreviation "GC" stand for?

  10. What step must be performed on 4-aminophenol during paracetamol retrosynthesis before reaching phenol?

  11. What is the use of benzaldehyde and acetone?

  12. What is meant by the statement that the two polynucleotide chains of DNA are opposite to each other?

Q4. Short questions (Attempt any 6 of 9 · 6 × 2 = 12)

  1. Predict the  spectrum of butanoic acid.

  2. The molecular formulas of the following compounds are given below: but-1-ene: C4H8 buta-1,3-diene: C4H6: Find out the IHD of both of these compounds.

  3. What legal actions can be taken against an individual or industry under the Punjab Water Act, 2019?

  4. What is surge current, what causes it, and why is it dangerous for a solar power system?

  5. What are the severe health risks posed to humans by exposure to heavy pesticide residues?

  6. State two differences between and NMR spectroscopies.

  7. Explain how the two isomers shown in the diagram can be distinguished using the IR spectroscopy. image

  8. Why does plastic waste persist in water bodies for a very long period?

  9. Why is the recycling of aluminium considered highly efficient compared to using raw ore?

Q5. Long questions (Attempt any 3 of 5 · 3 × 8 = 24)

  1. Describe in detail the double helix model of DNA as proposed by Watson and Crick in 1953.

  2. Explain the principle and working process of thin layer chromatography (TLC) in detail.

  3. Explain the factors that determine the specific geometry (shape) of a transition metal complex.

  4. Assess the Paradigm Shift in Drug Discovery by Comparing Traditional Total Synthesis and Artificial Intelligence (AI) Pathways.

  5. Describe the industrial preparation of quicklime from limestone. Explain the calcination process, reaction conditions, equilibrium control, and major industrial applications.