Coliform bacteria in water is an indication of the presen...
Coliform bacteria in water is an indication of the presence of
radioactive wastes
excess fertilizer
decaying animals and plants
human feces
Correct answer is D
No explanation has been provided for this answer.
Permanent hardness of water is caused by the presence of ...
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Permanent hardness of water may be removed by the addition of ...
The methods used for biological treatment are ...
Which is true about rennet? ...
Sanitizer used specifically for vitreous enamel are ...
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Both temporary and permanent hardness of water can be removed by ...