Hardness of water is due to:
(A) Oxygen
(B) dissolved substances
(C) Hydrogen
(D) too much of salt
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Answer Posted / suchi
dissolved substances
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hi..... my name is Rekha... i taken karantaka bank clerk and officer exam..... if any know the pattern and details please send me in my id..... if u have question paper please send...... my id rekhakh23@yahoo.com
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