the salt that causes hardness in water and carbon dioxide on heating is
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A variety of magnesium and calcium compounds in water cause it to be hard
Carbon heated in air will do it, and any compound of carbon when heated in air will do it. Limestone (and other carbonate minerals) will give off CO2 when heated, even in vacuum.
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The salts that causes the hardness in water and also liberate carbon dioxide on heating are Magnesium sulphate and calcium sulphate. The reason is that these sulphate salts do not decompose on heating and they and therefore the water remains hard.
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