A) Addition of potassium permagenate
B) Boiling
C) Filtration
D) Addition of chlorine
Correct Answer: B
Solution :
By boiling temporary hardness of water can be removed. \[Ca{{(HC{{O}_{3}})}_{2}}\xrightarrow{\text{Boil}}\underset{\text{(insoluble)}}{\mathop{CaC{{O}_{3}}}}\,+{{H}_{2}}O+C{{O}_{2}}\]
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