Chemistry-I (Gr-B) 2024 — MAKAUT · BS-CH101 · Mid Sem PYQ with solutions

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Maulana Abul Kalam Azad University of Technology

Solutions

34 answers across 3 groups

Try each question first, then open it to check your answer.

Group AVery Short Answer Type Question · answer any 10 · 1 mark each

  1. I

    Write name of a molecule which have infrared active vibrations.

    Free sample

    Answer: Hydrogen chloride (HCl\text{HCl})

    Explanation

    (Any heteronuclear diatomic molecule or polyatomic molecule like H2O\text{H}_2\text{O} or CO2\text{CO}_2 that has a change in dipole moment during vibration is IR active.)

  2. II

    The strength of van der Waals forces depends upon which factor?

  3. III

    Write one process where entropy decreases.

  4. IV

    What is the shape of XeF4 molecule?

  5. V

    For n – butane which type of conformation is the least stable?

  6. VI

    In SN1 type reaction which type of solvent is used?

  7. VII

    If uncertainty in position and momentum are equal then what will be the uncertainty in velocity?

  8. VIII

    Which is detected by IR spectra?

  9. IX

    Which interaction is the strongest interaction?

  10. X

    What is the internal energy change for a cyclic process?

  11. XI

    Write the increasing order of effective nuclear charge in Na, Al, Mg and Si?

  12. XII

    Give one example of ambidentate ligand.

Group BShort Answer Type Question · answer any 3 · 5 marks each

  1. 2

    Define Van der Waals forces. Discuss their nature.

  2. 3
    • (a)
      Explain the term chemical potential.
    • (b)
      Derive the relation of EMF of cell with ΔG\Delta G and ΔH\Delta H.
    Show answer to question 3
  3. 4

    State the reason for the presence of only one electron in the 4s subshell of chromium? Which of the following has larger size and why? (i) Mg2+ (ii) N3-

  4. 5
    • (a)
      Distinguish between constitutional isomers and stereo isomers.
    • (b)
      What is chirality?
    • (c)
      Does presence of two chiral carbon atoms always make the molecule optically active? Explain.
    Show answer to question 5
  5. 6

    'All adiabatic reversions lead to a fall of temperature.' – Comment or justify.

Group CLong Answer Type Question · answer any 3 · 15 marks each

  1. 7(a)

    Phenol on treatment with Br2 in CS2 at low teamperature gives two isomeric monobromophenols X and Y. But phenol on treatment with bromine water gives a white precipitate Z. Identify the products X, Y and Z with chemical reactions.

    6 marks
  2. 7(b)

    What do you mean by enantiomer and diastereomer? Differentiate them with examples.

    4 marks
  3. 7(c)

    Explain the difference between a meso – isomer and a recimic mixture. What characteristics do they have in compound?

    5 marks
  4. 8(a)

    Draw the π\pi– molecular orbital diagram of Benzene. Predict whether the following compounds are aromatic, anti – aromatic or anti – aromatic: (i) Furan (ii) Cyclopentadienyl cation.

    5 marks
  5. 8(b)

    Write notes on Synthesis of paracetamol.

    5 marks
  6. 8(c)

    Nitration is also in absence of H2SO4 yet H2SO4 has no effect on benzene under the conditions employed. Show the mechanism of nitration of benzene.

    5 marks
  7. 9(a)

    Set up the Schrodinger equation for a partical in a one - dimensional box.

    5 marks
  8. 9(b)

    Show how the model of particle in a box can be applied to calculate the energy spectra of polyene.

    4 marks
  9. 9(c)

    What is zero point energy of a particle in one dimensional box? Why the energy of this particle cannot be zero at zero point energy? If the zero point energy of the particle in one dimensional box is 2.5 eV, what is the next higher energy value?

    6 marks
  10. 10(a)

    What is the difference between ionization energy and election affinity? The first ionization energy of carbon is greater than that of boron whereas the reverse is true for the second ionization energy.

    5 marks
  11. 10(b)

    Why does Mn (II) is 3d5? Would you classify Zn as a transition element? Give reasons for your answer.

    5 marks
  12. 10(c)

    Expain that ionisation energy of neon is more than any other element of the second period? Why do the transition elements from complexes readily?

    5 marks
  13. 11(a)

    What would have happened to the gas if the molecular collisions were not elastic?

    3 marks
  14. 11(b)

    CO2 is heavier then O2 and N2 gases present inthe air but it does not form the lower layer of the atmosphere. Why?

    3 marks
  15. 11(c)

    Why in case of hydrogen and helium, the compressibility factor is always greater than 1 and increases with increase in pressure?

    3 marks
  16. 11(d)

    Why gases can be liquefied by cooling?

    3 marks
  17. 11(e)

    Which type of liquids will have higher boiling points? ‘Polar or Non – polar liquids” – Give reason for your answer

    3 marks

About this paper

The MAKAUT Chemistry-I (Gr-B) (BS-CH101) 2024 Mid Sem previous year question paper, set in semester 1. Download the verified PDF or read it online, then check your answers against the worked solutions above.

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What is the subject code for Chemistry-I (Gr-B)?

BS-CH101 is the MAKAUT subject code for Chemistry-I (Gr-B).

Which exam is this Chemistry-I (Gr-B) question paper from?

The MAKAUT 2024 Mid Sem exam, semester 1. A student shared it, and it was checked before publishing.

Which branches is this Chemistry-I (Gr-B) paper for?

It's a common paper for 8 B.Tech branches: Civil Engineering, Computer Science and Engineering, Computer Science and Engineering (Data Science), Electronics and Communication Engineering, Electrical Engineering, Information Technology, Mechanical Engineering and Computer Science and Engineering (Artificial Intelligence and Machine Learning). Every branch gets the same questions.

Where can I find more BS-CH101 question papers?

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