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WorksheetsWater
Total questions: 15
Worksheet time: 8mins
Hardness of water is due to the presence of salts of ____________
Potassium
Chlorine
Magnesium
.Boron
Hardness of water is conventionally expressed in terms of equivalent amount of ---------
H2CO3
MgCO3
CaCO3
Na2 CO3
If the precipitate formed is soft, loose and slimy, these are __________
Sludges
Scale
rodent
All the above
The scales decrease the efficiency of boiler and chances of explosions are also there.
yes
no
The phenomenon during which the boiler material becomes brittle due to accumulation of caustic substances is known as ___________
Foaming
Priming
Corrosion
Caustic embrittlement
Foaming is caused by the formation of ___________
Acids
Alcohols
Oils and Alkalies
Ketones
The chemical formula of zeolite is ___________
FeSO4.7H2O
Al2(SO4)3.18 H2O
Na2O.Al2O3.xSiO2.yH2O
Na2Al2O
Natrolite is an example of ___________
Synthetic zeolite
Natural zeolite
Calgon
Colloid
What is Calgon?
Potassium hexa meta sulphate
Magnesium hexa meta phosphate
Sodium hexa meta phosphate
Calcium hexa meta sulphate
Which of the following is not used in colloidal conditioning?
Kerosene
Tannin
Agar-agar
vinegar
The example of brackish water is ___________
Ground water
Sea water
Rain water
Underground water
Which of the following technique is not used for the desalination of brackish water?
Electrolysis
Electrodialysis
Reverse osmosis
Distillation
The process of reverse osmosis is also known as ___________
Hyper-filtration /Super filtration
Double-filtration
Double-osmosis
Hyper-osmosis
The pH for the potable water should be in the range of ___________
5-6
7-8.5
9-10
12-13
The total hardness of the potable water should be less than ___________
500 ppm
700 ppm
900 ppm
1000 ppm
