The purest form of water is
A). Tap water
B). Rain water
C). Ground water
D). Distilled water
Which method will be employed to test the hardness of water?
A). Boiling
B). Distillation
C). Formation of lather with soap
D). None of these
Hard water and soft water can be distinguished by using
A). Dilute acid
B). Ordinary soap
C). Detergent
D). Liquid soap
The process of removing calcium and magnesium from hard water is known as
A). Sedimentation
B). Filtration
C). Flocculation
D). Water softening
Bleaching powder is used in drinking water as a/an
A). Disinfectant
B). Antibiotic
C). Antiseptic
D). Coagulant