M.Sc. (Semester III) (CBCS) Examination Nov/Dec-2018
Analytical Chemistry
INSTRUMENTAL METHODS OF ANALYSIS I
Time: 2½ Hours
Max. Marks: 70
Instructions: All questions are compulsory. Figures to the right indicate full marks. Use of log table and calculator is allowed.
Q.1
Multiple choice questions.
14
In situ generation of known amounts of chemical reagents from a titrant precursor forms the basis of
controlled potential coulometry
controlled current coulometry
coulometric titrations
all of these
Ion selective membranes work on the principle of,
Migration of ions from high to low concentration
Migration of ions from low to high concentration
Exchange of ions in membrane with solution
Adsorption of ions in solution on membrane
An example of the electrode in solid-state ion selective electrode for
determinations is,
BF3
LaF3
PF5
NaF
Becquerel discovered radioactivity
Using a GM-counter
By observing radiation damage to his skin
By using photographic film
By using a cloud chamber NaF
Which of the following isotopes is not a radioisotope?
Carbon-13
Cabon-14
Tritium
Sulphur-35
Which of the following is true?
The area under a DTA peak represents the enthalpy of the change
In DTA both the reference and the sample undergoes change with temperature.
DTA stands for Direct Thermal Analysis
All of these
Which of the following is not a type of radiation detectors?
Geiger Muller counter
Proportional counter
Semiconductor detector
Flame emission detector

Scintillation detector is a larger flat crystal of which of the following materials?
Sodium chloride
Sodium iodide
Sodium sulphate
Sodium carbonate
Page 2 of 3
SLR-VF-182
In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of
Solid material
Semi- permeable membrane
Hydrophobic material
Water absorbing material
10) In the heat vs temperature plot of DSC of a polymer the glass transition is represented by
A gradual slope
A hump
Glass transition cannot be detected
A kink
11) In high frequency titrimetry, the titration curve depends on
concentration of the substance being titrated
change in frequency
change in oscillator current
all of these
12) Which of the following electrochemical methods requires the formation of an insoluble form of the analyte?
electrogravimetry
coulometry
potentiometry
voltammtery
13) The limiting current in a linear sweep voltammogram is related to
The standard reduction potential for the redox couple under investigation
The reduction potential of the reference electrode
The point at which concentration polarization begins
The concentration of the analyte of interest.
14) The current due to supporting electrolyte is
diffusion current
residual current
migration current
limiting current
Q.2
a)Answer the following (Any four)
08
Give the basis of electrogravimetric method of analysis.
Name of the different microelectrodes used in amperometric titrations.
Define endotherm and exotherm.
Why oxygen is removed from the solution under voltammetric study? How it is removed?
Mention different nuclear radiations.
b)Write notes on (Any two)
06
Amperometric titrations
Cells used in high frequency conductometric titration technique
Radioimmunioassy
Q.3
a)Answer the following(Any two)
08
Differentiate between nuclear radiations and γ.
Explain the principle of neutron activation analysis with suitable example.
Express reversible and irreversible waves.
b)Answer he following (Any one)
06
Discuss the principle and working of coulometer.
With neat labeled diagrams, describe the cells used in high frequency titrations

a)Answer the following (Any two)
10
What are ion selective electrodes? Explain liquid-liquid membrane electrodes.
Draw the thermogram for calcium oxalate and discuss the characteristic features of the curve.
Discuss the kinetic parameters of thermal degradation.
b)Answer the following (Any one)
04
Differentiate between power compressed and heat flux DSC.
What are the various advantages of dropping mercury electrode.
Q.5
Answer the following (Any Two)
14
a)What are radioactive tracers? Discuss the applications of it in physico-chemical investigations.
b)Describe with suitable example solid state electrodes.
c)Discuss the direct and reverse isotopic dilution analysis.