Question:
Which of following is responsible for temporary hardness of water?
Which of following is responsible for temporary hardness of water?
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Temporary = Bicarbonate ($HCO_{3}^{-}$); Permanent = Chloride or Sulfate ($Cl^{-}, SO_{4}^{2-}$).
Updated On: Jul 4, 2026
- $NaHCO_{3}$
- $Ca(HCO_{3})_{2}$
- $NaHSO_{4}$
- $CaCl_{2}$
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Verified By Collegedunia
The Correct Option is B
Solution and Explanation
Step 1: Concept
Hardness is divided into temporary (carbonate) and permanent (non-carbonate) hardness.
Step 2: Meaning
Temporary hardness is caused by the presence of dissolved bicarbonates of calcium and magnesium.
Step 3: Analysis
Chlorides and sulfates of Ca/Mg cause permanent hardness. Sodium salts like $NaHCO_{3}$ do not cause hardness.
Step 4: Conclusion
$Ca(HCO_{3})_{2}$ is the substance listed that causes temporary hardness. Final Answer: (B)
Hardness is divided into temporary (carbonate) and permanent (non-carbonate) hardness.
Step 2: Meaning
Temporary hardness is caused by the presence of dissolved bicarbonates of calcium and magnesium.
Step 3: Analysis
Chlorides and sulfates of Ca/Mg cause permanent hardness. Sodium salts like $NaHCO_{3}$ do not cause hardness.
Step 4: Conclusion
$Ca(HCO_{3})_{2}$ is the substance listed that causes temporary hardness. Final Answer: (B)
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