BCHET141 EM 2023 SOLVED ASSIGNMENT

Description

ASSIGNMENT
ANALYTICAL METHODS IN CHEMISTRY
Course Code: BCHET-141
Assignment Code: BCHET-141/TMA/2023
Maximum Marks: 100
PART A 50
1 How will you carry out collection of water samples and their preservation? (5)
2. Write various sources of Determinate Errors. (5)
3. What is F-test? To illustrate “F” test suppose that two series of observations are made one
of 4 observations of standard deviation equal to 0.02 and another of 6 observations of
standard deviation equal to 0.04. Then what do we have to test?
(5)
4 Explain the terms-distribution ratio and distribution coefficient. When are these two terms
not identical? Discuss.
(5)
5 When is solvent extraction useful? Using suitable diagram, explain how it is carried out. (5)
6 Explain various types of liquid chromatographic techniques with the help of a suitable
diagram.
(5)
7 How can you separate the components A, B and C of a mixture using paper
chromatography? Explain using suitable diagram. (Rf
value of B is greater than A but less
than C.)
(5)
8 What are the similarities and differences in adsorption and partition chromatographies? (5)
9 Explain the development of chromatogram for the separation of the mixture containing
three compounds P, Q and R using frontal analysis. Give suitable diagram also.
(5)
10 Discuss natural ion exchangers by giving suitable examples. (5)
PART B 50
11 Derive the Nernst expression for a galvanic cell. (5)
12 What are the characteristics of a reference electrode? Describe the construction
and working of a Calomel electrode.
(5)
13 What are molar conductivity and limited molar conductivity? Resistance of a
conductivity cell filled with 0.1M KCl solution is 100 Ω. If the resistance of the same
cell when filled with 0.02 M KCl solution is 520 Ω, calculate the conductivity and
molar conductivity of 0.02 M KCl solution. The conductivity of 0.1 M KCl solution is
1.29 S m-1
.
(5)
14 Discuss various sources of errors in TGA. (5)
15 A mixture of CaCO3 and CaO is analysed using TGA method. TG curve of the sample
indicates that there is a mass change from 290.6 mg to 230.8 mg
between 500-900C. Calculate the percentage of CaCO3 in sample.
(5)
16 Briefly explain the nature of spectra in atomic and molecular systems with the help of
suitable examples.
(5)
17 Discuss the methodology of quantitative determinations by UV-VIS spectrometry. (5)
18 a) Describe the steps involved in getting IR spectrum of the sample using FT-IR
instrument with interferometer.
b) List the advantages of FT-IR instrument over dispersive IR instrument.
(2)
(3)
19 Explain the characteristics of atomic spectra. (5)
20 Discuss the merits and limitations of FAE spectrometry