A water-insoluble substance X on reaction with dilute hydrochloric acid released a colourless and odourless gas accompanied by brisk effervescence. When the gas passed through water, the solution obtained turns blue litmus red. On bubbling the gas through lime water, it initially became milky and milkiness disappeared when the gas was passed in excess. Identify the substance X. Write the chemical equation of the reaction involved.
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Answer:
The formula of the insoluble substance is CaCO3. When this is added to dilute HCl, the colourless and odourless gas obtained will be CO2. This gas turns lime water milky. The lime water turns milky due to the precipitate of CaCO3 which is insoluble in water.
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Explanation:
Calcium carbonate on reacting with dilute sulphuric acid release the colourless and odourless gas accompanied by bricks effervescence, which is called carbondioxide.
The chemical equation for this reaction is
CaCO3 + H2SO4 → CaSO4 + H2O + CO2
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