GK
ECOLOGY BIODIVERSITY CONSERVATION ENVIRONMENTAL ISSUES
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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As per Indian Standards (BIS) for drinking water desirable limit for total hardness as CaCO3 is
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100 mg
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200 mg
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300 mg
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400 mg
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Explanation:
Detailed explanation-1: -Hardness in water is caused by dissolved calcium and magnesium. It is measured usually as Calcium Carbonate in milligrams per litre (mg/L). The Bureau of Indian Standards prescribes a desirable limit of 200 mg/L and a maximum limit of 1000 mg/L in the absence of alternate source of water.
Detailed explanation-2: -Detailed Solution As per IS 1055: 2012, the permissible limits in absence of an alternate source of water for total Hardness and total dissolved solids in the drinking water respectively will be 600 ppm and 2000 ppm.
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