You are at question (MCQ) number 1 and Test Number 1 of Biology: All topics. To deal with Biology questions, you must take lesson on the subject. In case of science and Art subjects revise your text books and in case of general aptitude topics take lessons from the topic page.
The question: Permanent hardness of water is due to-
.... with options: Chlorides and sulphates of Calcium and Magnesium, Calcium bicarbonate sulphates, Magnesium bicarbonate , Clorides of Silver and Potassium can be solved with the concepts and understanding of Biology.
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