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.
Permanent hardness is removed by -
Options:
Answer:
D
Solution:
Permanent hardness is caused by chlorides and sulfates of calcium and magnesium (CaCl₂, MgCl₂, CaSO₄, MgSO₄).
It cannot be removed by boiling.
It is removed by adding sodium carbonate (Na₂CO₃), which precipitates calcium and magnesium as carbonates.
Reaction:
Hence, permanent hardness is removed by:
Stream:JEESubject:ChemistryTopic:Environmental ChemistrySubtopic:Water Pollution
⏱ 2mℹ️ Source: QB
Doubts & Discussion
Loading discussions...
