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IGNOU BCHCT-135 (January 2025 – December 2025) Assignment Questions
PART-(A)
1. Discuss the effect of pressure on the solubility of gases. How is Henry’s law constant determined?
2. Draw and explain the mutual solubility curve of nicotine-water system. Which other system exhibits the similar curve?
3. (a) What are conjugate solutions? Give one example.
(b) Define metastable equilibrium and differentiate it from true equilibrium
4. Define any five of the following terms:
(i) A component
(ii) Mole fraction
(iii) Incongruent melting compounds
(iv) Liquid junction potential
(v) Ionic mobility
(vi) Conductometric titration
5. (a) Give the mathematical expression for Gibbs’ phase rule and calculate the maximum number of phases that can coexist for a one-component system.
(b) Draw the phase diagram for sulphur system and label the sublimation and fusion curves for monoclinic sulphur on it.
6. (a) How does vs. T curves for a pure substance get affected by an increase in pressure? Draw a schematic diagram indicating the same?
(b) Two substances, X and Y form a simple eutectic system. The melting point of X is more than that of Y and a mixture of X and Y having 40% of X form the eutectic mixture having a melting point of 512 K. Based on this information, draw a schematic suitably labelled phase diagram for the system.
7. (a) Explain the concentration dependence of molar conductivity for a strong electrolyte
(b) The conductivity of a saturated solution of AgCl at 298 K was found to be 3.41 × 10–6 S cm–1. The water used for dissolving AgCl had a conductivity of 1.6 × 10–6S cm–1. If the molar conductivity at infinite dilution for AgCl at 298 K is given as 138.2 S cm–1mol–1, calculate the solubility product of AgCl at 298 K.
8. (a) Describe the moving boundary method for the determination of transference numbers.
(b) In the determination of transference numbers of HCl by moving boundary method a 0.10 M solution of HCl was taken in a cell having uniform area of cross section of 1.0 cm2. At the end of experiment the boundary moved by 10.3 cm and 0.132 g of silver was deposited on the cathode of silver coulometer. Calculate the transference numbers of ions of HCl.
9. (a) Outline the requirements for the construction of concentration cells without transference.
(b) The cell reaction for a galvanic cell is given below:
Cu(s) + 2Ag+(aq) →Cu2+(aq) + 2Ag(s)
(i) Write the half-cell reactions at the anode and the cathode.
(ii) Calculate the value of cell emf under standard conditions by using the data from Table 7.1.
(iii) Will the reaction be spontaneous as written?
10. (a) Define electrolysis and discuss any one application of electrolysis.
(b) Calculate the time required to get 5 g of magnesium by passing a current of 0.6 A through molten magnesium chloride. (Given: Mm(Mg) =24.25 g mol–1).
11. How will you prepare 2-methylpentanoic acid starting from a suitable alkyl halide? Write the sequence of reactions involved.
12. (a) Which alkyl halide will you use if pentanoic acid is to be obtained? Give the scheme of synthesis involved.
(b) Write the mechanism of amide formation using ethanoic acid and ammonia.
13. (a) What is transesterification? Briefly explain using a suitable example.
(b) Give the products formed when propyl butanoate is reduced using Bouveault-Blanc reduction. Which other reagent can be used to obtain the same products?
14. (a) Using suitable diagram, explain the interconversion of enantiomers of N-methylethanamine.
(b) Explain why C-N bond in benzenamine is shorter than that in aliphatic amines
15. (a) Which one is more stable-alkyl diazonium salt or an aryl diazonium salt? Explain.
(b) How can you obtain 4-methylbiphenyl from 4-methylbenzenaine? Write the reactions involved.
16. (a) Explain the Zwitter ionic nature and isoelectric point of a 2-amino acid.
(b) Discuss the chemistry of ninhydrin reaction of 2-amino acids and its importance
17. Discuss the N-protection and deprotection of amino acids using phathaloyl group.
18. Explain sanger method for the N-terminal identification of peptides giving suitable reactions.
19. What are reducing sugars? Which tests are exhibited by them? Give the chemistry of these tests.
20. How was structure of lactose arrived at? Explain. Also write the structure of its -anomer.
IGNOU BCHCT-135 (January 2024 – December 2024) Assignment Questions
PART-(A)
1. Discuss the fractional distillation for a mixture of benzene and toluene using a suitable diagram.
2. (a) Give the thermodynamic derivation of distribution law.
(b) Write any two applications of solvent extraction.
3. (a)Derive the expression for distribution coefficient when the solute dissociates is one of the solvents.
(b) Differentiate between true, metastable and unstable equilibria giving suitable examples.
4. (a) State Gibbs phase rule and give its mathematical form.
(b) How many components are there in the following systems? Briefly discuss.
5. (a) Calculate the maximum number of phases and maximum number of degrees of freedom that
(b) Can exist for a one-component system. When is a system called invariant? Illustrate with an example.
6. Draw and explain the phase diagram of sulphur
7. (a) Define conductivity. Give its SI units.
(b) List various factors on which the conductivity of electrolytic solutions depends.
8. Draw and explain the conductometric titration curves for the titration of the following:
(i) HCl vs NaOH
(ii) CH3COOH vs NaOH
9. (a) List the functions of a salt bridge.
(b) What are the conditions which a reversible cell should satisfy.
10. (a) What is an electrolyte concentration cell? Write the expression for Ecell for such a cell.
(b) Write the reactions occurring at electrodes in the electrolysis of water. Why are a few drops of conc. H2SO4 added in this process?
PART-(B)
11. Discuss the two methods of decarboxylation of carboxylic acids and comment on the nature of products formed.
12. How can you propane the following compound starting from ethanoyl chloride?
13. Briefly explain Hofmann elimination. Also give the importance of this reaction.
14. Differentiate between Sandmeyer reaction and Gattermann reaction giving suitable examples.
15. Discuss the Hinsberg test for distinguishing primary, secondary and tertiary amines.
16. (a) Discuss the preparation of 2-aminobutanoic acid using Strecker synthesis.
(b) What is cope elimination? Give reaction.
17. (a) Briefly explain this general structure and classification of peptides.
(b) What is bradykinin? Give its role?
18. How is C-terminal indentified in a peptide or a protein? Discuss.
19. (a) Explain the cyctic hemiacetal formation by glucose.
(b) Explain mutarotation in glucose.
20. Discuss the important features of structure of cellulose giving suitable diagram.
BCHCT-135 Assignments Details
University
:
IGNOU (Indira Gandhi National Open University)
Title
:
Solutions, Phase equilibrium, Conductance, Electrochemistry and Functional Group Organic Chemistry-II
IGNOU BCHCT-135 (Jan 24 - Dec 24, Jan 25 - Dec 25) - Solved Assignment
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