M.Sc. (Semester II) (CBCS) Examination Nov/Dec-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.
From question No. 2 to 6 attempt any three questions.
All questions carry equal marks.
SECTION I
Q.1 Rewrite the sentences by choosing correct answer from given alternatives: 14
In gravimetric estimation of iron hydroxide reagent is used.
Sodium Barium
Ammonium Potassium
Select the primary standard used in redox titration
NaOH K2Cr2O7
CaCO3 HCl
In Acid-base titration which indicator is used
Phenolphthalein Erichrome Black-T
Methylene blue None of these
All chromatographic techniques are based on the principle of
Electrolysis Separation
Solvation Precipitation
The process of extracting a small portion from a large quantity of material
representing its true composition is called
Sampling Extraction
Qualitative analysis Quantitative analysis
Classification of chromatographic method is based on the phenomenon
involving the process of either or
Emulsion or Inversion Sorption or Occlusion
Absorption or Adsorption Partition or Adsorption
Quinhydrone is mixture of quinone hydroquinone.
1:2 1:1
2:3 3:5
The titrations in which end points are determined by emf measurements are
called titration.
Coductometric Colorimetric
Potentiometric PH metric
In a conductivity cell plates are used as a electrode.
Copper Aluminium
Zinc Platinum
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SLR-VA-7
10) Glass electrode is used in type of titrations.
Complexometric Potentiometric
PH metric Conductometric
11) The PH range of methyl red indicator is
7-10 4-7
4.2-6.3 7.3-9.5
12) In simple flame photometers, the monochromator is
Prism Grating
Slit All of these
13) When a molecule rotate a plane of the plane polarized light in anticlockwise
direction, it is known as compound.
Meso Dextro rotatory
Laevo rotatory None of these
14) In polarography, specific rotation depends on
Temperature Concentration
Wavelength All of these
SECTION II
Q.2 Describe the principle and working of polarimeter. 07
What is mean by chromatography? Describe the methodology of ionexchange
chromatography.
07
Q.3 Explain precipitation titration w.r.t. Al and Cu. 07
Describe the principle, development and types of paper chromatography. 07
Q.4 Describe the process of redox titration in detail. 07
Describe the working of potentiometer. 07
SECTION III
Q.5 What is the purpose of sampling? How is it done for solid, liquid and gases? 05
Describe gravimetric estimation of Fe. 05
Write the applications of voltametry in trace analysis. 04
Q.6 What is the basic difference between flame photometer and AAS? Which is
superior for pesticide analysis and how?
05
Describe estimation of halides by using conductometer. 05
Write a note on metallochromic indicator. 04
Q.7 Describe working of nephelometer. 05
Write applications of PH meter in analysis of water and pesticide residue. 05
Draw schematic diagram of flame photometer and AAS. 04