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Punjab (PTB) · Quarter book test · Free

2nd Year Chemistry 3rd Quarter Book Paper

40 marks · 1 hour · 28 questions. Covers: 5 chapters (CHAP 27: BIOCHEMISTRY to CHAP 31: MATERIALS AND ENERGY).

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2nd Year Chemistry 3rd Quarter Book Paper

2nd Year · Chemistry · Punjab (PTB)

Name: ____________Roll No: ________Class/Section: ________Date: ________Total marks: 40Time: 1 hour

Q1. Multiple choice questions (Attempt all · 12 × 1 = 12)

  1. 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

  2. Penicillin kills bacterial strains by targeting the enzyme:

    1. Carbonic anhydrase

    2. Succinate dehydrogenase

    3. Trans-peptidase

    4. Amylase

  3. Deuterated solvents are used in to:

    1. Increase magnet strength

    2. Split the signals

    3. Provide a reference signal

    4. Avoid solvent signal interference

  4. 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

  5. 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

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

    2. M + 1

    3. M - 1

    4. M + 4

  7. 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'

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

    1. Singlet

    2. Doublet

    3. Triplet

    4. Quartet

  9. A mobile phone contains a variety of:

    1. Only metals

    2. Only plastics

    3. Metals, plastics and their composites

    4. Only ceramics

  10. 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

  11. Which of the following compounds can produce the IR spectrum shown below? image

    1. Propanoic acid

    2. 4-hydroxybutanone

    3. Pentan-1-ol

    4. 2-hydroxybut-1-ene

  12. Which of the following is classified as a macro-mineral?

    1. Iron

    2. Zinc

    3. Iodine

    4. Magnesium

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

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

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

  3. 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.

  4. Predict the  spectrum of butanoic acid.

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

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

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

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

  9. State two differences between and NMR spectroscopies.

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

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

  12. What are ores?

Q3. Long questions (Attempt any 3 of 4 · 3 × 4 = 12)

  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. Describe the low resolution  spectrum interpretation.

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