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WorksheetsU4 T4 Thermal methods of analysis and Method validation
Total questions: 25
Worksheet time: 8mins
Name
Class
Date
1.
The highest temperature a TG furnace required to attend
a)
1773 K
b)
1273K
c)
1313K
2.
______ shaped crucible is prefered in thermal methods
a)
oval
b)
flat
c)
cup
3.
Copper sulfate gets converted into copper oxide in a temperature range of ______ K
a)
973-1113
b)
473- 548K
c)
671 - 751K
4.
A peakindicating exothermic reaction is _____ the base line
a)
above
b)
below
c)
slope in
5.
______ is a reference material for organic substances in DTA
a)
octyl pthalate
b)
α - alumina
c)
silicon carbide
6.
Metallic sample holder gives _____ endothermic peak and _____ exothermic peak
a)
Sharp-flat
b)
flat-shrp
c)
wide-blurr
7.
In DTA the results obtained in ______ gas atmosphere are more reliable.
a)
static
b)
dynamic
c)
inert
8.
For crystalline polymers, transition occurs at about ____ dgree celcius
a)
200
b)
480
c)
320
9.
Single pan thermobalence is used in ______
a)
TGA
b)
DTA
c)
DSC
10.
______ can determine composition of complex mixtures
a)
TGA
b)
DTA
c)
DTG
11.
Regrssion coefficient should be greter than _____ to consider data as linear
a)
one
b)
0.998
c)
0.999
12.
A slope of calibration curve is equal to the _____ of data.
a)
selectivity
b)
sensetivity
c)
liniarity
13.
Inter-laboratory precision is called as _____
a)
accuracy
b)
repeatability
c)
liniarity
14.
In DTA curve melting is indicated by
a)
exotherm
b)
endotherm
c)
platau
15.
In ___ __ flask temperature of titrant is not affected by environment
a)
thermocool
b)
dewar
c)
refrigirated
16.
In DSC, the energy required to establish _____ difference is measured as a function of temperature
a)
temperature
b)
volume
c)
mass
17.
Roasting and calcination of minerals is studied by
a)
DTG
b)
DTA
c)
TGA<br />
18.
Above 1000 degrres celcius, cupric acid transforms to _____
a)
cuprous sulfate
b)
copper hydroxide
c)
cupric oxide
19.
According to DTA,Calcium carbonaate decomposes decomposes to CaO above ______ degree celcius
a)
500
b)
800
c)
740
20.
Magnecium oxalate doesnot pass through ____ stage
a)
dehydration
b)
carbonate
c)
oxidation
21.
In DTA, cooling is done by ____
a)
dry ice
b)
liquid nitrogen
c)
liquid ammonia
22.
For a reference material in DTA _____ should be same as that of sample
a)
thermal conductivity
b)
heat capacity
c)
cooling rate
23.
When magnecium ions react with EDTA, heat is _____
a)
absorbed
b)
evolved
c)
exchanged
24.
Using masking and demasking agents, ____ of EDTA is increased
a)
sensetivity
b)
selectivity
c)
normality
25.
If a method changes its proportionality of signal with respect to concentration, then the method is not ______
a)
linier
b)
sensetive
c)
selective
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