Assertion (A) : When `CO_2` is passed through lime water the soluting turns miky but with an excess of `CO_2` the solution ehcomes calear agnin .
Reason (R) : Excess `CO_2` changes the seupension to a colloidal solution .

Options

A. If both (A) and (R) are correct and (R) is correct explanation of (A)
B. If both (A) and (R) are correct and (R) is not correct explanation of (A)
C. If (A) is correct , but (R) is incorrect
D. If (A) is incorrect but (R) is correct .

Answer

C

Explanation

Correct reason : `Ca (OH)_2 + CO_2 rarr underset (("Milkiness")) underset ("Calcium Carbonate") (CaCO_3 +H_2O)`
`CaCO-3 + CO_2 +H_2 O rarr underset ("Calicum bicarbonate") (Ca(HCO_3)_(2(aq))`.