Chemistry - Environmental Chemistry Question with Solution | TestHub
ChemistryEnvironmental ChemistryWater PollutionMedium2 minQB
ChemistryMediumsingle choice
Passage / Comprehension
The hardness of natural water is generally caused by presence of bicarbonates, chlorides and sulphates of calcium and magnesium but infact soluble salts that form a scum with soap cause hardness. Hardness of water is two types : (1) temporary hardness. (2) permanent hardness.
Temporary hardness is caused due to the presence of -
Options:
Answer:
D
Solution:
Temporary hardness of water is caused by the presence of bicarbonates of calcium and magnesium.
Examples: Ca(HCO₃)₂ and Mg(HCO₃)₂.
Carbonate (CO₃²⁻), sulfate (SO₄²⁻) and phosphate (PO₄³⁻) salts do not cause temporary hardness.
Therefore, the given options do not include bicarbonate ion (HCO₃⁻).
Correct option: (D) None
Stream:JEESubject:ChemistryTopic:Environmental ChemistrySubtopic:Water Pollution
⏱ 2mℹ️ Source: QB
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