A) K
B) \[N{{a}_{2}}C{{O}_{3}}\]
C) \[C{{l}_{2}}\]
D) \[Ca(OCl)Cl\]
Correct Answer: B
Solution :
As permanent hardness can be removed by using washing soda\[(N{{a}_{2}}C{{O}_{3}}),\]Calgan, Zeolite, etc. Hence, the correct option is (b).
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