Assertion : $C a C O_{3}$ is prepared by passing carbon dioxide gas through slaked lime. Reason: Passing excess of $C O_{2}$ through slaked lime leads to the formation of quick lime.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Passing excess carbon dioxide through slaked lime turns it milky, leads to the formation of $C a C O_{3}$ which reacts with excess $C O_{2}$ and water to form calcium hydrogencarbonate or calcium bicarbonate.
$C a (O H)_{2} + C O_{2} \to C a C O_{3} \to C a (H C O_{3})_{2}$

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Assertion :CaCO3 is prepared by passing carbon dioxide gas through slaked lime. Reason: Passing excess of CO2 through slaked lime leads to the formation of quick lime.

The correct option is C Assertion is correct but Reason is incorrectPassing excess carbon dioxide through slaked lime turns it milky, leads to the formation of CaCO3 which reacts with excess CO2 and water to form calcium hydrogencarbonate or calcium bicarbonate.Ca(OH)2+CO2→CaCO3→Ca(HCO3)2

Assertion : $C a C O_{3}$ is prepared by passing carbon dioxide gas through slaked lime. Reason: Passing excess of $C O_{2}$ through slaked lime leads to the formation of quick lime.