BCHET-141 · December 2023 · English
IGNOU BCHET-141 December 2023 Previous Year Question Paper
Analytical Methods In Chemistry
Structured previous year question paper for BCHET-141, December 2023 session.
Max marks: 50 · Questions: 15
Verified: 29 Jul 2026
B. SC. (GENERAL) (BSCG)
Term-End Examination
December, 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.Calculate mean, median, mode and average deviation for a set of the following observations :
Q2.6, 9.2, 9.8, 9.2, 9.3, 9.5 and 9.
(2)
Q3.Define the terms accuracy and precision with suitable examples and illustrations.
Q4.Explain any one mechanism of solvent extraction of inorganic species in brief.
Q5.Derive the expression for percent extraction (% E) in terms of distribution coefficient
(D), if volumes of aqueous and organic phase are equal. If a species is extracted in 25 ml each of organic and aqueous phase and shows D = 24, then calculate % E.
Q6.Explain Ry value with illustration. Name two examples each of mobile phase and locating agent.
Q7.Match the following—properties and characteristics of chromatography : 5
(i) Surface area and
(a) Elution method particle size Gi) Adsorbent
(b) Partition chromatography Gii) Flow rate
(c) Stationary phase
(iv) Liquid-Liquid
(d) Column chromatography
(v) Isocratic solution
(e) Mobile phase
Q8.What is partition chromatography ? Discuss its similarities and differences from adsorption chromatography.
Q9.Thermogram of a magnesium compound (200 mg) shows a loss of 104 mg. Identify the compound as MgO, MgCOs or MgC20,.
Q10.Name three common reference electrodes used in potentiometry. Describe any one of these with illustration.
Q11.Explain the principle of Wheatstone bridge with a circuit diagram. Show how it can be used for the measurement of conductance.
Q12.Differentiate between
(i) Atomic and molecular spectra and
(ii) Line and band spectra with suitable illustration for each case.
Q13.Explain the difference between single beam and double beam spectrophotometer with the help of schematic diagrams of both.
Q14.Write the different types of vibrations in polyatomic molecules with suitable illustration for each. Explain the selection rules for IR spectrometry.
Q15.Describe Hollow Cathode Lamp (HCL) and draw its schematic diagram.
Q16.Discuss advantages and disadvantages of total consumption burner.
Q17.6, 9.2, 9.8, 9.2, 9.3, 9.5 और 9.
(2)
Q18.1. 0.
Q19.1. 0.