Question

Assertion: Lime water becomes trubid on passing `CO_(2)` but becomes clear on passing more `CO_(2)`.
Reason: Lime water is calcium hydroxide, `Ca(OH)_(2)`.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. if both assertion and reason are true but reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If the assertion and reason both are false.

Answer 1

Correct Answer - B
Lime water become turbid on passing `CO_(2)` into it because both reacts to produce insoluble calcium carbonate.
`underset("Lime water")(Ca(OH)_(2))+CO_(2)to underset("Calcium carbonate (Insoluble)")(CaCO_(3))+H_(2)O`
If more `CO_(2)` is passed then soluble calcium bicarbonate is formed which clear the solution
`underset("Insoluble")(CaCO_(3))+H_(2)O+CO_(2) to underset("Calcium bicarbonate (soluble)")(Ca(HCO_(3))_(2)`
The reason that lime water is `Ca(OH)_(2)` is also correct. Here, both assertion and reason are correct but reason is not a correct explanation of assertion.