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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Details For BCHET-141 Solved Assignment

IGNOU BCHET-141 Assignment Question Paper 2023

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

PART A

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.

PART B

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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