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Worksheetsenvironmental Engg. Lab, Day4, CE791
Total questions: 10
Worksheet time: 2mins
Name
Class
Date
1.
Hardness causes due to presence of
a)
Ca - salts
b)
Mg- Salts
c)
Fe- salts
d)
all of these
2.
Hardness is
a)
2 types
b)
3 types
c)
4 types
d)
none
3.
Temporary hardness is caused , due to presence of
a)
HCO3-1
b)
CO3-2
c)
Cl-1
d)
none
4.
permanent hardness is caused due to presence of
a)
CO3-2
b)
SO4-2
c)
Cl-1
d)
all of these
5.
indicator used in the experiment of hardness determination
a)
EBT
b)
Calcon
c)
both a and b
d)
none of these
6.
During the titration, colour change is
a)
from pink to blue
b)
from blue to pink
c)
from pink to colourless
d)
none
7.
the unit of hardness is
a)
mg/l
b)
kg/l
c)
ppm
d)
none
8.
EBT act in pH
a)
10
b)
8
c)
9
d)
none
9.
example of basic buffer is
a)
sodium acetate and acetic acid
b)
ammonium hydroxide and ammonium chloride
c)
both
d)
none
10.
how to remove temporary hardness
a)
Soda- Lime
b)
Zeolite
c)
only by boiling
d)
none
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