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CHEMCO Exit Exam • Set 15 Question 8 of 30

When CO2 is passed through, lime water, milkiness is formed is due to :

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Direct Answer

Option A: CaCO3- Calcium Carbonate

Passing carbon dioxide (CO2) through limewater (calcium hydroxide, Ca(OH)2) causes a reaction that produces insoluble calcium carbonate (CaCO3). This precipitate is responsible for the characteristic milky appearance, a common test for CO2 presence.

All Options

A
CaCO3- Calcium Carbonate (Correct Answer)
B
Ca(OH)2- Calcium Hydroxide
C
Ca(HCO3)2- calcium bi-carbonate

Detailed Explanation & Context

Passing carbon dioxide (CO2) through limewater (calcium hydroxide, Ca(OH)2) causes a reaction that produces insoluble calcium carbonate (CaCO3). This precipitate is responsible for the characteristic milky appearance, a common test for CO2 presence.

Relevant Framework: STCW 2010 Manila Amendments • DG Shipping E-Learning & Exit Exam Standards • Advanced Training for Chemical Tanker Cargo Operations (CHEMCO).

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