A. Before filtration, reduces the bacterial load on filters
B. After filtration, combats the corrosiveness of water due to the presence of O2 & CO2
C. Is to adjust the pH value
D. All A , B. and C.
Related Mcqs:
- One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to_________________?
A. Adjust the pH of the syrup
B. Remove the coloring matter from the syrup
C. Reduce the viscosity of the syrup
D. Improve the rate of crystallisation of sugar - Lime and soda ash are added to water to remove ___________________?
A. Bicarbonates & sulphates of calcium and magnesium
B. Undesirable taste and odour
C. Bacteria
D. Its corrosiveness - ______________________ of quicklime produces slaked lime ?
A. Hydration
B. Dehydration
C. Hydrogenation
D. None of these - High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to__________________?
A. Flocculate the impurities
B. Facilitate fast filtration
C. Both A. and B.
D. Neither A. nor B. - Calcination of limestone is not done in a ______________ kiln for producing lime ?
A. Vertical shaft
B. Rotary
C. Fluidised bed
D. Fixed bed - Separation of fresh water from sea water can be done by the _______________ operation ?
A. Osmosis
B. Reverse osmosis
C. Absorption
D. Adsorption - Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of_____________________?
A. Calcium sulphate
B. Sodium chloride
C. Sodium sulphate
D. Magnesium chloride - Very fine suspended and colloidal impurities are removed from water by a process called___________________?
A. Sedimentation
B. Coagulation
C. Disinfection
D. Softening - The product obtained on mixing calcium oxide with water is called __________________?
A. Quicklime
B. Slaked lime
C. Milk of lime
D. None of these - Use of water having dissolved oxygen in boilers promotes___________________?
A. Corrosion
B. Sequestration
C. Scale formation
D. None of these
