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WorksheetsU1 T4 Final Electroanalytical Techniques
Total questions: 25
Worksheet time: 9mins
Name
Class
Date
1.
Mathematical statement of Ilkovik euqation is
a)
id= 607n D2 1 m32 t61 C
b)
id= 607n D32 m21 t61 C
c)
id= 706n D2 1 m32 t31 C
d)
Pass
2.
Sensitivity of polarographic estimation can be as low as
a)
10-6M
b)
10-4M
c)
10-3M
d)
Pass
3.
Polarography is a technique which deals with ______
a)
Polarization of light
b)
Dropping mercury electrode
c)
sat. KCl solution
d)
Pass
4.
In polarography, wave height is equal to
a)
limiting current
b)
diffusion current
c)
decomposition potential
d)
Pass
5.
Pilot ion method is same as
a)
standard addition method
b)
calibtation method
c)
internal standard method
d)
Pass
6.
Capillary characteristic include
a)
m and t
b)
n and M
c)
D and t
d)
Pass
7.
Dissolved oxygen in water can be eliminated using
a)
KCl electrolyte
b)
Triton 100-X
c)
Nitrogen
d)
Pass
8.
When titrand (in beaker) is reducible and other species are not reducible, the amperometric titration curve us
a)
V shaped
b)
L shaped
c)
ɹ shaped
d)
Pass
9.
In amperometric titration, the cathode is
a)
DME
b)
SCE
c)
Pt - wire
d)
Pass
10.
Two reducible species in a solution can be estimated by polarography when their half wave potential differ by __<br />
a)
0.2 V
b)
0.4 V
c)
0.02 V
d)
Pass
11.
Amperometric titrations are carried out by keeping the _____ constant
a)
current
b)
potential
c)
concentration
d)
Pass
12.
Dissolved oxygen can be estimated by
a)
Colourimetry
b)
Potentiometry
c)
Polarography
d)
Pass
13.
Maxima supressor in polarography are
a)
reducing agents
b)
oxydizing agents
c)
surface active agents
d)
Pass
14.
In Ilkovik equation, the term D means
a)
Distribution ratio
b)
Dielectric constant
c)
Diffusion coeffiecient
d)
Pass
15.
The unit of concentration in Ilkovik equation is
a)
moles/L
b)
milimoles/L
c)
miligrams/L
d)
Pass
16.
The dissolved oxygen forms ______ waves during polarography
a)
two
b)
three
c)
one and half
d)
Pass
17.
For different reducible species ______ is different
a)
diffusion current
b)
applied potential
c)
half wave potential
d)
Pass
18.
The term 'm' in Ilkovik equation corrosponds to
a)
mass of the mercury drop
b)
atomic mass of reducible species
c)
drop rate of mercury
d)
Pass
19.
Migration current is made zero by ____
a)
applying exact decomposition potential
b)
passing nitrogen
c)
adding supporting electrolyte
d)
Pass
20.
Voltametry corrosponds to measurement of _______
a)
current
b)
voltage
c)
potential
d)
Pass
21.
Polararization of an electrode is caused due to
a)
back emf
b)
polarity of solvent
c)
applied potential
d)
Pass
22.
At limiting current, the concentration of metal ion at DME ____
a)
is euqal to zero
b)
is maximum
c)
at limiting value
d)
Pass
23.
Tge capillary of DME is cleared using ___
a)
1:1 HCl
b)
1:1 HNO3
c)
1:1 liq. Ammonia
d)
Pass
24.
Identification of the reducible species can be done by knowing
a)
diffusion current
b)
half wave potential
c)
discharge potential
d)
Pass
25.
The rotating Pt electrode used in aperometric titration rotates at the speed of _____ revolutions per minute
a)
few hundred
b)
few thousand
c)
twenty<br />
d)
Pass
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