1.

Which of the following process does not remove the permanent hardness of water?(a) Lime-soda(b) Ion exchange process(c) Zeolite process(d) HeatingThe question was posed to me during a job interview.The origin of the question is Estimation of Hardness in section Water of Applied Chemistry

Answer»

The correct choice is (c) Zeolite PROCESS

Best explanation: Heating of the water REMOVES the temporary hardness and the permanent hardness is REMOVED by the zeolite process, lime soda process and the ion exchange method.



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