Discussion
Assertion (A) : Carbon dioxide turns lime water milky.
Reason (R) : Carbon dioxide sullies the water.
Answer: C
Correct answer: A is true but R is false.
Carbon dioxide does turn lime water milky, so A is true. But the milkiness is a precipitate of insoluble calcium carbonate: \[ \mathrm{Ca(OH)_2 + CO_2 \rightarrow CaCO_3 \downarrow + H_2O} \] not any “sullying” of the water. R is false.
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