BCHET-141 · June 2023 · English
IGNOU BCHET-141 June 2023 Previous Year Question Paper
Analytical Methods In Chemistry
Structured previous year question paper for BCHET-141, June 2023 session.
Max marks: 50 · Questions: 18
Verified: 29 Jul 2026
B. SC. (GENERAL) (BSCG)
Term-End Examination
June, 2023
BCHET-141 : ANALYTICAL METHODS IN
CHEMISTRY
Time : 2 Hours Maximum Marks : 50
Note :
(i) Answer any ten questions.
(ii) All questions carry equal marks.
Q1.Write any five precautions required for sampling.
Q2.A diabetic patient on a single day observed the following glucometer readings :
Q3.110, 105, 108, 106, 111 and 105 Calculate mean, median, mode, range and average deviation.
Q4.Explain the principle of solvent extraction and define distribution coefficient. Name two types of extraction processes.
Q5.Define and differentiate between terms batch extraction and continuous extraction.
Q6.Explain chromatography. Who discovered it ?
Q7.How is this technique classified depending on the basis of mobile and stationary phases?
Q8.What is column chromatography ? Name any four adsorbents and _ write their characteristics.
Q9.Math the following : 5 Group-A Group-B
(6) Analcite
(a) Strong anion exchanger
(i) Styrene & Divinyl-
(b) Decreasing benzene order of selectivity
(ii) —CH, N(CH), Increasing efficiency
(iv) Ba2* > Ca2* > Cu2* > Zn2*
(d)_ Nature Ion exchanger
(v) Particle size of resin
(e) Copolymer
Q10.Draw a labelled block diagram of thermobalance stating all the components.
Q11.Illustrate shape of a typical thermogravimetric (TGA) curve.
Q12.Enlist any five types of electroanalytical methods and explain salient features of any one of these briefly.
Q13.Explain electrolytes and non-electrolytes with classification and examples for each.
Q14.What is wave number
(v) ? If wavelength
(A) is 450 nm then calculate its wave number and energy
(E). (h = 6.626 x 10-34Js andc =3 x 108 ms~!).
Q15.Draw a generalized molecular orbital energy level diagram for organic molecules showing all possible transitions. Indicate the type of transitions in the following organic molecules : CH3CHO and RCH = CHz.
Q16.Write briefly about sources of radiation and sampling devices in IR spectrometric instrumentation. (2x2)
Q17.Draw a schematic structure of laminar flow flame showing various zones. Write temperatures of oxy-acetylene and hydrogen-air fuel oxidant compositions.
Q18.Name five processes occurring in flame photometric experiment and explain each one briefly with illustration.
Q19.110, 105, 108, 106, 111 और
Q20.1. 0.
(ii) CH, N(CH), ©) a ar (h = 6.626 x 10-34 Js di c=3x108ms-}H
(1)
Q21.1. 0.