Font size
WorksheetsSoftening of hard water
Total questions: 11
Worksheet time: 7mins
Identify water softening methods from following
Reverse Osmosis
Deionisation
Zeolite method
electrodialysis
activated sludge
In lime soda method the principle is ----
Convert soluble salt into insoluble precipitate
substitute cations and anions of hardness producing salts
replace cations by Na+
none of the above
Anion Exchange and Cation Exchange resins are part of (a) process.
In an ion exchange process, ions removed from the water are exchanged with ions of _____________ from the resin's surface.
Similar charge (+ ,+)
Opposite charge (+, -)
Water softened by Deionisation process has residual hardness as --
>50 ppm
> 10 ppm
< 2 ppm
100 ppm
Advantages of ion exchange process are
Highly acidic and basic water can be treated
no sludge formation
cost effective method
compact
skilled supervisor required
Disadvantage of Ion exchange process is --
Costly
more residual hardness
Difficult to operate
Turbidity and suspended particles can block the resin pores
Once the water softening is done, we need to throw resins.
TRUE
FALSE
In regeneration of cation exchange resin ----is used
HCl, H2SO4 etc
NaOH, KOH etc
NaCl, Na2SO4 etc
Alcohols
Calcium and magnesium are replaced by ----
and Sulphates, Nitrates and chlorides are replaced by ---respectively
(a)
Write your name and roll number
