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Permanent hardness of water cannot be removed by which one of the following methods?a)Treatment with washing sodab)Calgon’s methodc)Boilingd)Ion exchange methodCorrect answer is option 'C'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about Permanent hardness of water cannot be removed by which one of the following methods?a)Treatment with washing sodab)Calgon’s methodc)Boilingd)Ion exchange methodCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Permanent hardness of water cannot be removed by which one of the following methods?a)Treatment with washing sodab)Calgon’s methodc)Boilingd)Ion exchange methodCorrect answer is option 'C'. Can you explain this answer?.

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