<prompt> Hardness of water is contributed by following salts except -Calcium gluconateMagnesium chlorideCalcium sulfateMagnisium bicarbonate  <response>: The hardness of water is caused mainly by four dissolved compounds.These are Calcium bicarbonate Magnesium bicarbonate Calcium sulphate Magnesium sulphate Presence of any of these salt produces hardness refer pgno:727 park 23rd edition 