An element reacts with oxygen to give a component with high melting point this components is also soluble in water the element is likes to like to be a option calcium carbonate silicon iron
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like solvents dissolve like solute therefore water is a polar solvent which can only dissolve polar solute or ionic solute calcium carbonate is a ionic compound as it can completely dissociate into ions that is CA + 2 and CO3-2.so,CaCO when heated in presence of O2 CaCO3 is formed which is crystall in presence of water
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