M.Sc. (Semester (CBCS) Examination Mar/Apr-2018
Chemistry
ANALYTICAL CHEMISTRY I
Time: 2½ Hours
Max. Marks: 70
Instructions: Attempt five questions. All question carry equal marks. (Section Q.1 is compulsory. Attempt any two questions from section II and two questions from section III Answer to all 05 questions (from section II, III) should be written in the one and the same answer book. Figures to the right indicate full marks. Use of log table and calculators is allowed.
Section I
Q.1
Answer the following:
14
What are different types of samples?
Define variance.
What is supporting electrolyte?
Define residual and diffusion currents
What is a resolution?
What is the use internet in education and research?
What is the software?
Define accuracy.
What is a partition coefficient?
10) Define string.
11) What kind of systematic errors are detected by varying the sample size?
12) What are the advantages of the linear regression?
13) Where does the van Deemter equation used? Name all the terms involved in it.
14) What is amperometry?
Section II
Q.2
Explain in detail the sources of systematic errors.
07
With the help of schematic diagram explain the instrumentation of amperometer and discuss amperometric titration curves.
07
Q.3
What are the different conditional statements and loops used in basic programming? Explain the loops.
07
The A and B components in HPLC separation have retention times that differ by 16 s and the dead time was 1.5 min. The first peak of A elutes at 10 min, and both the peak widths of A and B are equal. Calculate the minimum number of theoretical plates to achieve resolution vales 1.0 and 2.0. What would be the value of N if peak B has twice width than peak A.
07
Q.4
Discuss the procedure for the detection of the systematic method error.
07
Discuss the used of Microsoft word, excel and PowerPoint in chemistry.
07
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SLR-UF-146
Section III
Q.5
Write a note on the Sampling Homogeneous Solutions of Liquids and Gases.
05
Draw a schematic and labeled diagram of HPLC and briefly explain the function of each of its components.
05
Write down the procedure to determine the half wave potential.
04
Q.6
Enlist the characteristics of the ideal detectors. Discuss the flame ionization detector.
05
Explain the dropping mercury electrode. Discuss the qualitative and quantitative applications of polarography.
05
What is the Ilkovic equation? Discuss the effect of each term on the diffusion current.
04
Q.7
Write a note on any Three of the following.
14
Write a note on the Microcomputer interfacing?
Write a note on the continuous flow sampling.
The following results were obtained in the replicate determination of the lead content of a blood sample: 0.752, 0.756, 0.751, and 0.760 ppm Pb. Find the mean and the standard deviation of this set of data.
Write a note on the stationary phases used in gas-liquid chromatography and discuss applications of each.