Lime water becomes milky due to which of the following gases?

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RRB NTPC Exam 19 Jan 2021 click here to view all questions

Lime water becomes milky due to which of the following gases?

ACO₂

BO₂

CNO₂

DN₂

Akhilesh ? Apr 16 '25 at 23:06

correct answer is: option a (CO₂)
Explanation: Lime water, which is an aqueous solution of calcium hydroxide (\(Ca(OH)_2\)), turns milky when carbon dioxide (\(CO_2\)) gas is passed through it. This is because \(CO_2\) reacts with \(Ca(OH)_2\) to form calcium carbonate (\(CaCO_3\)), which is an insoluble white precipitate, causing the milky appearance.

• Option a: \(CO_2\) reacts with lime water (\(Ca(OH)_2\)) to form insoluble \(CaCO_3\), making it milky.
• Option b: \(O_2\) does not react with lime water to produce a milky appearance.
• Option c: \(NO_2\) reacts with lime water but does not produce a milky appearance. It forms calcium nitrite and calcium nitrate.
• Option d: \(N_2\) is generally unreactive and does not react with lime water to produce a milky appearance.

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correct answer is: option a (CO₂) Explanation: Lime water, which is an aqueous solution of calcium hydroxide (\(Ca(OH)_2\)), turns milky when carbon dioxide (\(CO_2\)) gas is passed through it. This is because \(CO_2\) reacts with \(Ca(OH)_2\) to form calcium carbonate (\(CaCO_3\)), which is an insoluble white precipitate, causing the milky appearance. Option a: \(CO_2\) reacts with lime water (\(Ca(OH)_2\)) to form insoluble \(CaCO_3\), making it milky. Option b: \(O_2\) does not react with lime water to produce a milky appearance. Option c: \(NO_2\) reacts with lime water but does not produce a milky appearance. It forms calcium nitrite and calcium nitrate. Option d: \(N_2\) is generally unreactive and does not react with lime water to produce a milky appearance. Akhilesh ? answered Apr 16 '25 at 23:06

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