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Question

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


A

CaCO3

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B

Ca(OH)2

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C

Ca(HCO3)2

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D

Noneofthese

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Solution

The correct option is A

CaCO3


The explanation for the correct option:

(A) CaCO3

Lime water is calcium hydroxide that, when exposed to carbon dioxide, turns milky due to the production of calcium carbonate(CaCO3).

Reactions

Ca(OH)2aq+CO2gCaCO3ppt+H2Ol

The explanation for the incorrect options:

Option (B)

when (CO2) is passed through lime water calcium carbonate is formed, not calcium hydroxide

Option (C)

Ca(HCO3)2 is formed when (CaCO3) reacts with both water and carbon dioxide.

Hence, option (A) is correct.


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