Description
ASSIGNMENT
Solutions, Phase Equilibrium, Conductance, Electrochemistry & Functional
Group Organic Chemistry-II
Core Course in Chemistry
Course Code: BCHCT-135
Assignment Code: BCHCT-135/TMA/2025
Note: Attempt all questions. The marks for each question are indicated against it.
Maximum Marks: 100
PART-(A)
1.
2.
3.
4.
5.
6.
7.
8.
Discuss the effect of pressure on the solubility of gases. How is Henry’s law constant determined?
Draw and explain the mutual solubility curve of nicotine-water system. Which other system
exhibits the similar curve?
(a)
(b)
What are conjugate solutions? Give one example.
Define metastable equilibrium and differentiate it from true equilibrium
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
(a)
(b)
(a)
(b)
(a)
(b)
(a)
(b)
Give the mathematical expression for Gibbs’ phase rule and calculate the maximum number
of phases that can coexist for a one-component system.
Draw the phase diagram for sulphur system and label the sublimation and fusion curves for
monoclinic sulphur on it.
How does vs. T curves for a pure substance get affected by an increase in pressure? Draw a
schematic diagram indicating the same?
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.
Explain the concentration dependence of molar conductivity for a strong electrolyte
The conductivity of a saturated solution of AgCl at 298 K was found to be 3.41 × 10–6S 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.
Describe the moving boundary method for the determination of transference numbers.
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.
(50)
(5)
(2)
(2)
(3)
(5)
(2)
(3)
(2)
(3)
(2)
(3)
(2)
(3)
3
9.
(2)
(a)
(b)
(i)
(ii)
(iii)
Outline the requirements for the construction of concentration cells without transference.
The cell reaction for a galvanic cell is given below:
Cu(s) + 2Ag+(aq) →Cu2+(aq) + 2Ag(s)
Write the half-cell reactions at the anode and the cathode.
Calculate the value of cell emf under standard conditions by using the data from Table 7.1.
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.
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