If the precipitate formed is soft, loose and slimy, these are __________ and if the precipitate is hard and
adhering on the inner wall, it is called _____________
a) Sludges, scale
b) Scale, sludges
c) Sludges, rodent
d) Scale, rodent
adhering on the inner wall, it is called _____________
a) Sludges, scale
b) Scale, sludges
c) Sludges, rodent
d) Scale, rodent