when the gas formed in heating limestone is passed through freshly prepared lime water , the lime water turns milky
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because limestone contains carbon dioxide
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Answer:
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Explanation:
(i) On heating, limestone undergoes thermal
decomposition to form calcium oxide (quick
lime) and carbon dioxide.
CaCO3(s) ∆ CaO(s) + CO2
↑
quick lime
(ii) Calcium oxide when dissolved in water forms
Calcium hydroxide (lime water).
CaO(s) + H2
O(l) → Ca(OH)2(aq)
Calcium
hydroxide
(iii) When carbon dioxide is passed through lime
water it turns milky due to formation of white
precipitate of Calcium carbonate.
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2
O(l)
Calcium
carbonate
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