WorksheetsWater and its treatment
Total questions: 25
Worksheet time: 16mins
When temporary hard water CaCo3 is boiled, one of the substances formed is
calcium bicarbonate
calcium sulfate
hydrogen chloride
carbon dioxide
Calgon is used for removal of
sodium carbonate
permanent hardness of water
potassium carbonate
Alum is a
Coagulant
Catalyst
Disinfectant
An addition of small dose of chlorine gas to the filtered water is known as
coagulation
sedimentation
filtration
chlorination
The process in which water is passed through filter beds of sand and gravel to remove smaller particles of dust is called
coagulation
sedimentation
filtration
chlorination
Permanent hardness of water can not be removed by
Lime-soda process
Zeolite process
Boiling process
Ion-exchange process
Disinfection by ozone is due to liberation of
Oxygen
Nascent Oxygen
Molecular Oxygen
Oxide ion
Hardness due to 13.6 mg/l of CaSO4 can be expressed in terms of CaCO3 as
1
0.1
10
100
The exhausted Anion Ion exchange resin can be regenerated by use of (a) solution.
In phosphate conditioning, if boiler feed water is too alkaline (a) is used for conditioning.
-------------- Acid kills bacteria in chlorination of water .
(a)
The removal of salt from brackish or ocean water is known as:
denitrification
desalination
re-salination
hyper salination
Which of the following does not cause the permanent hardness in water?
Nitrates
Sulphates
Chlorides
Bicarbonates
Ion-exchange resin is ____________
Linear
Low molecular weight
Organic polymer with porous structure
Soluble
Scale formation in boilers causes
no loss of heat
wastage of heat
increase in efficiency
none of the above
Coagulants help in the settling of
suspended impurities only
fine suspended matter only
colloidal particles only
both (B) and (C)
The indicator employed for detection of hardness during titration with EDTA solution is
Methyl orange
Phenolphthalein
Eriochrome-Black-T
Diphenyl amine
Colloidal conditioning is used for
Normal boilers
Low pressure boilers
High pressure boilers
Not for boilers
The product formed in Caustic embrittlement when boiler is made up of iron
Sodium ferrite
Ferric Hydroxide
Sodium ferroate
Ferrous Hydroxide
The pH maintained in the estimation of hardness by EDTA method is (a) .
The hardness of water is 10ppm. It can be expressed in degree clerk is (a) .
The hardness of water is expressed in terms of (a) equivalence.
The disinfection action of bleaching powder is due to [ ]
HOCl
HCl
Ca(OH) 2
CaCl 2
The Scientific name of CALGON is
Sodium hexa meta phosphate
Sodium penta meta phosphate
Sodium hexa meta sulphate
Sodium tri phosphate
(a) is a soft, loose, slimy precipitate formed within the boiler
