M.Sc. (Semester II) (CBCS) Examination Mar/Apr-2018
Agrochemicals And Pest Management
ANALYTICAL TECHNIQUES FOR AGROCHEMICALS
Time: 2½ Hours
Max. Marks: 70
Instructions: All Sections are Compulsory. Question 1 should be answered by choosing the correct answer. Attempt in all five questions. All Question carry equal marks. From questions No 2 to 6 attempt any three questions.
SECTION I
Q.1
Choose the most correct answer (one mark
14
Anion exchange chromatography is used for separation of
Both cations and anions
Cations only
Anions only
Natural species
A polymer containing group acts as cationic resin.
Phenolic
Primary amine
Secondary amine
Tertiary amine
In paper Chromatography, the Rf value is given by the equation.
Distance travelled by solute divided by distance travelled by solvent
Distance travelled by solvent divided by distance travelled by solute
Distance moved by component divided by distance moved by solute
Distance moved by the substance divided by distance moved by solute
Methyl red is in acid solution.
Red
Yellow
Orange
Pink
In Gravimetric estimation iron is precipitated as
Iron powder
Iron Hydroxide
Iron Oxide
Iron Sulphate
In complex formation titrations, the indicators used are generally known as indicators.
Universal
Fluorescence
Metallochromic
Chromogenic
Z
In a conductivity cell plates are used as a electrode.
Copper
Aluminum
Zinc
Platinum
In potentiometric titration the potential of indicator electrode depends on the of ions present in the solution.
Pressure
Temperature
Volume
Concentration
SI unit of conductance is
siemen
ohm
ohm-1
mhos
Page 2 of 2
SLR-UA-7
10) The term PH was introduced by
S. P. L Sorenson
A. P. L Supermen
G. P. S. Lowry
Newton
11) Quinhydrone electrode is used in titration.
Conductometric
Potentiometric
Iodometric
Volumetric
12) One of the main forms of chemical interference in flame emission spectroscopy is
Salt formation
Ionization
Reduction
Complex formation
13) In the angle of the rotation of a plane polarized light is measured.
AAS
TGA
Colorimetry
Polarimetry
14) The hottest flame in O2 is produced by
Acetylene
Butane
Cyanogens
Hydrogen
SECTION II
Q.2
Explain principle of flame photometer with schematic diagram.
07
What are acid base titrations? Explain their types with example.
07
Q.3
Describe principle, working and applications of thin layer chromatography.
07
Describe in detail the procedure of stripping voltametry using hanging mercury drop electrode.
07
Q.4
What is paper chromatography? Explain various types of development of paper chromatography.
07
Explain precipitation titration w.r.t. determination of Mg, Zn and Ca.
07
SECTION III
Q.5
Write applications of turbidimetry.
05
Describe how sampling of solids and gases can be done?
05
Write note on specific and equivalence conductance.
04
Q.6
What are optically active pesticides? How are they analyzed?
05
Write applications of conductivity measurement in the analysis of salinity and soil moisture.
05
Describe gravimetric estimation of Fe.
04
Q.7
What are complexometric titrations? Describe metallochromic indicators.
05
Write applications of PH metry in food and juice analysis.
05
Write applications of atomic absorption spectrometer.
04