Related Questions

__________ is removed from water by lime-soda process.
A Foul smell and taste
B Iron and manganese
C Temporary hardness
D Permanent hardness
In lime-soda process
A Only carbonate hardness is removed
B Only noncarbonated hardness is removed
C Lime reduces the carbonate hardness and soda-ash removes the non-carbonate hardness
D Lime reduces the non-carbonate hardness and soda-ash removes the carbonate hardness
Lime and soda ash are added to water to remove
A Bicarbonates & sulphates of calcium and magnesium
B Undersirable taste and odour
C Bacteria
D Its corrosiveness
Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
A Fully crystalline
B Partly crystalline
C Amorphous
D None of these
When lime juice is dropped on baking soda, brisk effervescence takes place because the gas evolved is
A Hydrogen
B Oxygen
C Carbon dioxide
D All of them
Zeolite used in water softening process (cation exchange) is regenerated by washing with
A Brine
B Chloramines
C Sodium bisulphite
D Liquid chlorines
Quick lime (or caustic lime)
A Is obtained by the calcination of pure lime stone
B Has great affinity to moisture
C Is amorphous
D All the above
The heat treatment process used for softening hardened steel is
A Carburising
B Normalizing
C Annealing
D Tempering
Which method is suitable for water softening?
A Base exchange process
B Boiling process
C Sedimentation
D None of the above
Which one of the following is used for water softening?
A Mg(HCO3)2
B Na3PO4
C Na6P6O18
D Na2HPO4

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