Question : Milkiness observed on passing of carbon dioxide through lime water is due to the formation of:
Option 1: calcium hydroxide
Option 2: calcium bicarbonate
Option 3: calcium carbonate
Option 4: calcium chloride
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Correct Answer: calcium carbonate
Solution : The correct answer is calcium carbonate .
Lime water is chemically known as calcium hydroxide, which turns milky when carbon dioxide is passed through it. When carbon dioxide reacts with calcium oxide, it leads to the formation of calcium carbonate. It is a milky white precipitate. It is shown by the reaction: ca(OH) 2 + CO 2 -> CaCO 3 .
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