WorksheetsWater and its Treatment
Total questions: 24
Worksheet time: 15mins
Complete the following sentence "Hard water is water that
forms a lather easily with water.
does not form a lather easily with water
Which of the following compounds are responsible for causing temporary hardness in water?
CaCl2
Ca(HCO3)2
CaSO4
Mg(HCO3)2
_________ hardness can be removed by boiling while __________ hardness cannot by removed by boiling.
(a)
Hardness of Water always has to be expressed in terms of
CaSO4 equivalents
CaCl2 Equivalent
CaCO3 equivalents
All of the above
-----------is the pH required in the determination of Hardness of water by EDTA method
4 to 6
9 to 14
8 to 10
1 to 4
1 ppm is eual to ------------ 0Clark
(a)
One 0 French is equal to ----------ppm
(a)
-------------is the indicator used in EDTA method
EAR
EBT
ESR
Methyl Orange
Abbreviate EDTA-----------
(a)
Chlorides and Sulphates causes -------------type of hardness
Temporary Hardness
Permanent Hardness
Temporary hardness in water is removed by
a)filtration
b) sedimentation
c) boiling
d)coagulation
Blow –down operation causes the removal of
a) Scales
b) sludge’s
c) acidity
d) sodium chloride
Solubility of calcium sulphate in water [ ]
a) Increases with rise of temperature
b) Decreases with rise of temperature
c) Remains unaltered with rise of temperature
d) Dose not adopt any definite pattern with rise of temperature
Hard water is unfit for use in boilers for generating steam because
a) Its boiling point is higher
b) Steam is generated at higher temperature
c) Water decomposes into O2 and H2
d) It produces scales inside the boiler
Estimation of hard ness of water by EDTA method is used to determine
a) Alkaline hardness
b) temporary hardness only
c) Permanent hardness only
d) all
Calgon is a trade name given to
a) Sodium silicate
b) sodium hexameta phosphate
c) Sodium meta phosphate
d)
calcium phosphate
Caustic embrittlement can be avoided by using
a) Sodium phosphate
b) hydrogen
c) ammonium hydroxide
d) sodium sulphate
Disinfection by ozone is due to liberation of
a)Na3PO4
b)Nascent Oxygen
C)Mg3 (PO4)2
d)H3PO4
Tanin, Lignin are used for
a) Phosphate conditioning
b) carbonate conditioning
Collidal Conditioning
Liquid chlorine is a most effective
a) Disinfectant
b) coagulant
c)flocculants
d) sterilizing agent
Brackish water can be purified by using
Lime-Soda process
Reverse osmosis method
Pemuitit Process
Filtration
Caustic embrittlement caused due to presence of
NaCl
MgCO3
NaOH
KNO3
(a) is the disinfectant produced in chlorination process.
The chemical formula of Calgon is (a) .
