A) soft water
B) soft water first heated with lime stone
C) cone.\[HN{{O}_{3}}\]
D) soft as well as hard water
Correct Answer: B
Solution :
Soft water first treated with lime stone \[(CaC{{O}_{3}})\]contains some dissolved\[CO_{3}^{2-}\]ions in it which can form a coating of insoluble lead carbonate on the surface of lead pipe and protects it from further action.
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