A) by passing \[C{{O}_{2}}\]
B) by passing \[S{{O}_{2}}\]
C) by adding \[Ca{{(OH)}_{2}}\]
D) by adding \[NaCl\]
Correct Answer: C
Solution :
Temporary hardness of water can be removed by dark's process. In this process, water is treated with a calculated quantity of lime.
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