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Properties of CO2

wHen a water ...

Question

wHen a water insoluble substance X is added to dilute Hcl a colorless odourless gas is evolved when the gas is passed thru lime water it turns milky write the chemical formula of X and the chemical equation involved

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Solution

We know that the gas which turns lime water milky is carbon dioxide. This gas is produced when dilute HCl reacts with metal carbonates and metal bicarbonates. Since the given substance X is insoluble in water, therefore it is calcium carbonate (chemical formula CaCO₃). Following is the chemical equation for the reaction
CaCO₃ + 2HCl â†’ CaCl₂ + H₂O + CO₂

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