Annamalai University 2007 B.Sc Chemistry ANALYTICAL - Question Paper

Maximum : 100 Marks
ans any 1 ques. from every Unit.
All ques. carry equal marks.
(5 × 20 = 100)
UNIT - I
1. (a) discuss accidental errors with the normal
distribution curve. (4)
(c) explain the applications of uv - visible
spectroscopy to
(i) Conjugated dienes.
(ii) Benzene and its derivatives.
(10)
(OR)
6. (a) elaborate significances of selection rules
in IR and Raman spectra ? (4)
(b) Write a note on pre - dissociation. (6)
(c) (i) Write a note on coupling constant.
(5)
(ii) Write a note on chemical shift. (5)
UNIT - IV
7. (a) discuss the sources of errors in titrations
involving iodine. (4)
(b) 2nd group cations are precipitated as
sulphides in acid medium whereas fourth
group cations in basic medium. Account.
(6)
(b) provide the formula for standard deviation.
discuss its significance in data analysis.
(6)
(c) elaborate determinate and indeterminate
errors ? How are determinate errors
minimised ? (10)
(OR)
2. (a) What is meant by significant number ?
discuss with example. (4)
(b) discuss the fitting of a straight line, using
lowest squares method. (6)
(c) elaborate the various kinds of errors ?
discuss every 1 of them. (10)
UNIT - II
3. (a) provide the basic principle of cyclic
voltametry. (4)
(b) Compare nephelometry and turbidimetry.
(6)
(c) (i) Write a note on Half - Wave potential.
(5)
(ii) explain any 2 applications of
polarography. (5)
(OR)
4. (a) Amperometry is considered to be superior
to polarography. - Why ? (4)
(b) discuss the instrumentation procedures
involved in cyclic voltametry. (6)
(c) How will you determine any 1 metal
using fluorimeter ? discuss the
instrumentation. (10)
UNIT - III
5. (a) elaborate
(i) Rotational energy ?
(ii) Vibrational energy ? (4)
(b) compute the force constant for CO
molecule with fundamental frequency of
2143 cm.1. (6)
10. (a) What is resolution ? How is it achieved
in gas chromatography ? (4)
(b) Name the commonly used detectors in
GC. discuss their functions. (6)
(c) (i) discuss the terms.
(a) Mobile phase.
(b) Flow rate. (5)
(ii) Why chromatographic techniques are
considered to be superior than
solubility method of separation ? (5)
(c) explain the principle and theories involved
in co-precipitation and post - precipitation.
(10)
(OR)
8. (a) Write a note on precipitation from
homogeneous solutions. (4)
(b) elaborate the general conditions for
precipitation in Gravimetry ? (6)
(c) (i) explain red - ox titrations with a
suitable example. (5)
(ii) discuss how phosphate interferes in
cation analysis. (5)
UNIT - V
9. (a) elaborate eluents ? discuss elution. (4)
(b) Wvahluaet ?a r -e E thxep l faainct.ors which affect the ( R6)f
(c) provide an account of paper chromatography
in the identification and separation
processes. (10)

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Earning:   Approval pending.