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Punjab (PTB) · Half book test (board pattern) · Free

2nd Year Chemistry Second half Book Paper

85 marks · 3 hours · 55 questions. Covers: 8 chapters (CHAP 26: POLYMERS to CHAP 33: WATER).

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2nd Year Chemistry Second half Book Paper

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. 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

  2. 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

  3. 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

  4. Penicillin kills bacterial strains by targeting the enzyme:

    1. Carbonic anhydrase

    2. Succinate dehydrogenase

    3. Trans-peptidase

    4. Amylase

  5. Deuterated solvents are used in to:

    1. Increase magnet strength

    2. Split the signals

    3. Provide a reference signal

    4. Avoid solvent signal interference

  6. 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

  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. 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

  9. During eutrophication, what is the direct physical consequence of the rapid growth of algae?

    1. It warms the water currents

    2. It blocks sunlight and reduces oxygen levels in the water

    3. It introduces toxic heavy metal salts

    4. It speeds up the natural water cycle

  10. Which of the following fragments will not be produced in the fragmentation of hexane ?

    2. M + 1

    3. M - 1

    4. M + 4

  11. A mobile phone contains a variety of:

    1. Only metals

    2. Only plastics

    3. Metals, plastics and their composites

    4. Only ceramics

  12. Phosphodiester linkage joins which carbon atoms of adjacent sugars?

    1. 1' and 2'

    2. 2' and 3'

    3. 3' and 4'

    4. 5' and 3'

  13. What is the splitting pattern for a proton with 2 neighbouring protons (n = 2)?

    1. Singlet

    2. Doublet

    3. Triplet

    4. Quartet

  14. Which polymer combination is explicitly mentioned for making artificial blood vessel grafts?

    1. UHMWPE and PMMA

    2. Collagen and PLA

    3. Polyurethanes and Silicone

    4. PTFE and PET

  15. The topmost wet line reached by the solvent on the chromatography paper is called the:

    1. Base line

    2. Starting point

    3. Solvent front

    4. Retardation line

  16. Opiates trigger a neurochemical reaction specifically in which functional center of the brain?

    1. Auditory center

    2. Visual cortex

    3. Reward center

    4. Cerebellum coordination center

  17. What are the major sources of pesticides and herbicides polluting water systems?

    1. Industrial chimneys and mining

    2. Agricultural runoff and domestic gardening

    3. Hospital waste and urban sewage

    4. Electrical transformers only

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

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

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

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

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

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

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

  7. What is the principle of paper chromatography?

  8. How many amino acid units are present in each turn of an a-helix?

  9. Name a medical application designed using materials that break down when no longer needed.

  10. Name three environmental matrices where TLC can detect pollutants and toxic substances.

  11. Where are receptor proteins located and what is their role?

  12. Why can photodegradable plastics not be used for long-term storage?

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

  1. 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.

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

  3. Predict the  spectrum of butanoic acid.

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

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

  6. State two differences between and NMR spectroscopies.

  7. How will you differentiate between the following using the UV visible spectroscopy. image

  8. What are ores?

  9. Why does deuterium (D) not appear in a spectrum?

  10. Identify the functional groups responsible for the peaks labelled X and Y. image

  11. Which two specific structural attributes of a crystal can be mapped through the analysis of diffraction patterns and mathematical models?

  12. group is lying between  and a-CH group? What is the splitting pattern for the -CH2 -signal? Show your calculation.

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

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

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

  3. Define Therapeutic Index (TI) and write its mathematical expression.

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

  5. What are the two distinct mechanism stages targeted by antiviral medications?

  6. How does the decomposition of organic matter in polluted water contribute to global warming?

  7. Write these significance of Therapeutic Window and how it differs from Therapeutic Index.

  8. Why are coagulation and flocculation processes employed in water treatment?

  9. Why has the cement industry of Pakistan grown into a leading exporter to neighboring regions?

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

  1. How mass spectrometry is used to determine the isotopic mass and average atomic masses of elements? Explain giving an example.

  2. Explain the difference between DO, BOD, and COD; How they relate to the water pollution?

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

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

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