Question

What is observed when CO₂ gas is passed through lime water? (a) for a short duration. (b) for a long duration. Write the chemical reactions for the reactions involved? (c) What is chlor- alkali process? Write the chemical reaction taking place in the form of a balanced chemical equation. Name the gases liberated at cathode and at the anode respectively.








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Answer 1

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Reaction with limewater

Carbon dioxide reacts with limewater (a solution of calcium hydroxide, Ca(OH) 2), to form a white precipitate (appears milky) of calcium carbonate, CaCO 3. Adding more carbon dioxide results in the precipitate dissolving to form a colourless solution of calcium hydrogencarbonate.