IGNOU BCHET-141 Solved Assignment 2023 | B.Sc (G) CBCS

IGNOU BCHET-141 Solved Assignment 2023 | B.Sc (G) CBCS

Solved By – Narendra Kr. Sharma – M.Sc (Mathematics Honors) – Delhi University


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IGNOU BCHET-141 Assignment Question Paper 2023

Course Code: BCHET-141
Assignment Code: BCHET-141/TMA/2023
Maximum Marks: 100


1 How will you carry out collection of water samples and their preservation?

2. Write various sources of Determinate Errors.

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?

4 Explain the terms-distribution ratio and distribution coefficient. When are these two terms not identical? Discuss.

5 When is solvent extraction useful? Using suitable diagram, explain how it is carried out.

6 Explain various types of liquid chromatographic techniques with the help of a suitable diagram.

7 How can you separate the components A, B and C of a mixture using paper chromatography? Explain using suitable diagram. ( \(R_{\mathrm{f}}\) value of \(\mathrm{B}\) is greater than \(\mathrm{A}\) but less than C.)

8 What are the similarities and differences in adsorption and partition chromatographies?

9 Explain the development of chromatogram for the separation of the mixture containing three compounds \(\mathrm{P}, \mathrm{Q}\) and \(\mathrm{R}\) using frontal analysis. Give suitable diagram also.

10 Discuss natural ion exchangers by giving suitable examples.


11 Derive the Nernst expression for a galvanic cell.

12 What are the characteristics of a reference electrode? Describe the construction and working of a Calomel electrode.

13 What are molar conductivity and limited molar conductivity? Resistance of a conductivity cell filled with \(0.1 \mathrm{M} \mathrm{KCl}\) solution is \(100 \Omega\). If the resistance of the same cell when filled with \(0.02 \mathrm{M} \mathrm{KCl}\) solution is \(520 \Omega\), calculate the conductivity and molar conductivity of \(0.02 \mathrm{M} \mathrm{KCl}\) solution. The conductivity of \(0.1 \mathrm{M} \mathrm{KCl}\) solution is \(1.29 \mathrm{~S} \mathrm{~m}^{-1}\).

14 Discuss various sources of errors in TGA.

15 A mixture of \(\mathrm{CaCO}_3\) and \(\mathrm{CaO}\) is analysed using TGA method. TG curve of the sample indicates that there is a mass change from \(290.6 \mathrm{mg}\) to \(230.8 \mathrm{mg}\) between \(500-900^{\circ} \mathrm{C}\). Calculate the percentage of \(\mathrm{CaCO}_3\) in sample.

16 Briefly explain the nature of spectra in atomic and molecular systems with the help of suitable examples.

17 Discuss the methodology of quantitative determinations by UV-VIS spectrometry.

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.

19 Explain the characteristics of atomic spectra.

20 Discuss the merits and limitations of FAE spectrometry.

\(\operatorname{cosec}^2 \theta=1+\cot ^2 \theta\)

BCHET-141 Sample Solution 2023


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\(cot\:\theta =\frac{cos\:\theta }{sin\:\theta }\)

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