M.Sc. (Semester III) (CBCS) Examination Oct/Nov-2017
Agrochemicals And Pest Management
ANALYSIS OF AGROCHEMICALS
Day Date: Saturday, 25-11-2017 Max. Marks:70
Time: 02.30 PM to 05.00 PM
Instructions: Sections I is compulsory.
Attempt any Two questions from Section II
Attempt any Two questions from Section III
All questions carry equal marks
Section I
Q.1 Choose the most correct answer (one mark each): 14
In any chromatographic technique the number of phases involved is
0 2
1 3
The column in HPLC is made up of material.
Plastic Stainless steel
Rubber Silk
In paper chromatrography water adsorbed on paper acts as
Mobile phase Stationary phase
Indicator All of these
The technique of HPLC is developed by
Krikland and Perkins Cassidy and Mockel
Hamdy and Perkins Hess and Hotzel
In thin layer chromatography is used as solid support.
Silica gel Alumina
Kieselghur All of these
In Scintillation counter, the scintillations are produced on the screen coated
with
Zinc iodide Zinc sulphate
Zinc carbonate Zinc sulphide
Fluorescence and phosphorescence spectra generally consist of many lines,
mostly in region.
UV Visible
IR None
Absorption of UV radiations by organic compound leads to
Electronic changes Vibrational changes
Rotational changes None of these
Absorption maxima shift to longer wavelength due to presence of
Cyclic structure Conjugation
Saturated group None of these
10) IR spectroscopy is mainly useful in the determination of
Conjugation Functional group
Molecular weight Melting point
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SLR-MA-23
11) Among the following which is IR active molecule.
HCl N2
CCI4 CI2
12) radiations are used in NMR spectroscopy.
Microwave IR
Radio UV
13) is used as internal standard in NMR spectroscopy.
DMF TMS
CDCI3 Acetone
14) Carbonyl compound containing hydrogen, during fragmentation undergoes
rearrangement.
Hoffmann Beckmann
Mc-Lafferty Fries
Section II
Q.2 Explain principle, procedure and applications of paper chromatography. 07
Describe the method used for measurement of radioactivity. 07
Q.3 Distinguish Fluorescence from Phosphorescence in terms of mechanism by
which an excited molecule is deactivated.
07
Explain in brief types of electronic excitations in UV spectroscopy. 07
Q.4 Describe in brief analysis of ammonia. 07
Draw the schematic diagram of mass spectrometer and explain its working. 07
Section III
Q.5 Write applications of polarography for analysis of insecticides. 05
Describe types of vibrations in IR spectroscopy. 05
Write a note on Mc-Lafferty rearrangement. 04
Q.6 Write a note on Scintillation Counter. 05
Explain equivalent and non equivalent protons with example. 05
Explain different types of detectors in UV spectroscopy. 04
Q.7 Distinguish following pairs of compound by IR spectroscopy.
CH3-CH2-OH and CH3-COOH
CH3COCH3 and CH3-CH2-CHO
05
Predict the NMR spectra of following:
CH3CH2-COOH and CH3-CH2-CHO
05
Describe types of detectors in HPLC. 04