Question:
Temporary hardness of water is mainly caused by the presence of
Temporary hardness of water is mainly caused by the presence of
Show Hint
Types of hardness:
\[
\boxed{
\begin{aligned}
\text{Temporary hardness} &\rightarrow \text{Ca(HCO}_3)_2,\ \text{Mg(HCO}_3)_2\\
\text{Permanent hardness} &\rightarrow \text{CaSO}_4,\ \text{MgSO}_4,\ \text{CaCl}_2,\ \text{MgCl}_2
\end{aligned}
}
\]
Updated On: Jul 23, 2026
- Bicarbonates of Ca\(^{2+}\) and Mg\(^{2+}\)
- Sulphates and chlorides of Ca\(^{2+}\) and Mg\(^{2+}\)
- Sodium salts
- Dissolved oxygen
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Verified By Collegedunia
The Correct Option is A
Solution and Explanation
Temporary (carbonate) hardness is caused by the bicarbonates of calcium and magnesium.
It can be removed by boiling, which converts bicarbonates into insoluble carbonates.
Hence,
\[
\boxed{\text{Bicarbonates of Ca}^{2+}\text{ and Mg}^{2+}}
\]
is the correct answer.
Therefore,
\[
\boxed{(A)}
\]
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