BCHCT-135 · December 2022 · English
IGNOU BCHCT-135 December 2022 Previous Year Question Paper
Solutions, Phase Equilibrium, Conductance, Electrochemistry And Functional Group Organic Chemistry-Ii
Structured previous year question paper for BCHCT-135, December 2022 session.
Max marks: 50 · Questions: 15
Verified: 29 Jul 2026
BACHELOR OF SCIENCE (GENERAL)
(BSCG)
Term-End Examination
December, 2022
BCHCT-135 :SOLUTDNS,PHASE EQULBRUM,
CONDUCTANCE,ELECTROCHEM STRY AND
FUNCTDNAL GROUP ORGANE CHEM BTRY-IL
Time : 2 Hours Maximum Marks : 50
Note :
(i) Attempt any five questions from Part A
and any five questions from Part B on
separate answer sheets.
(ii) All questions carry equal marks.
Part—A (Marks : 25)
Q1.State Nernst’s distribution law. Give its any three applications.
Q2.(a) Which one of the following is correct statement for a solution of water and ethanol ? 1 G@)_ It obeys Raoult’s law. Gi) It shows positive deviation from Raoult’s law. Gii) It shows negative deviation from Raoult’s law.
(b) Give the expression for Clapeyron equation for vaporisation equilibrium. 1
(c) Write the mathematical expression for Gibbs’ phase rule and for a one-component system, calculate : 3 @) the maximum number of phases that can coexist, and
(i) the maximum number of degrees of freedom.
Q3.Two substances A and B form a simple eutectic system. The melting point of A is more than that of B and a mixture of A and B having 40%. A 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.
Q4.(a) Which one of the following solutions is an example of a nearly ideal solution ? 1 @ Asolution of benzene and toluene Gi) A solution of acetone and chloroform
(b) Define molar conductivity and explain the concentration dependence of molar conductivity for a strong electrolyte.
Q5.(a) Define normality. 1
(0) The molar conductivity of 0.1 M aqueous solution of acetic acid is 5.38 Sem? mol"!. If molar conductivity at infinite dilution for acetic acid is 390.5 Scm?mol-!, then calculate the ionisation constant of acetic acid.
Q6.(a) Give any three functions of salt bridge in a galvanic cell. 3
(b) Write the balanced cell reaction for the galvanic cell represented by the following cell representation : 2 Nig Nig | Pee) | Phos)
Q7.(a) What is Bunsen coefficient ? 1
(b) Give the sign and nature of process occurring on cathode in an electrolytic cell.
(c) Outline the requirements for the construction of concentration cells without transference. 3 Part—B (Marks : 25)
Q8.Discuss the mechanism of Hell-Vohlard- Zelinkski reaction.
Q9.(a) What is trans esterification ? Give a reaction to illustrate it. 2
(b) What is hydrogenolysis ? Give an example of this reaction. 2
(c) What are galactans ?
Q10.Discuss Gabriel synthesis. What is the advantage and the limitation of this synthesis ?
Q11.(a) G@) What products are obtained when benzene reacts with Br,/FeBr, ? 2 Gi) How can you prepare 1, 3, 5- tribromobenzene ? 2
(b) Name the enzyme which hydrolyses cellobiose.
Q12.Discuss the N-protection of amino group using Cbz and Boc groups giving suitable reactions.
Q13.How is the deprotection of the protected amino group done ?
Q14.(a) What is Edman degradation ? Discuss using appropriate reaction sequence. 4
(b) Name the monosaccharide units present in lactose.
Q15.(a) Write the structures of D-(+)-glucose, D-(+)-mannose and the phenylosazone formed from them. Is the phenylosazone formed same or different ? Justify your answer. 4
(b) Why can humans not use cellulose as food ? [91 BCHCT-135 [10 ] 80#० 1
(35)