Question

Which among the following reaction produces lime water?

• A. ${CaO + 2NH4Cl →[\Delta] CaCl2 + 2NH3 + H2O}$
• B. ${CaO + SiO2 → CaSiO3}$
• C. ${CaO + CO2 → CaCO3}$
• D. ${CaO + H2O → Ca(OH)2}$

Hint:

Quicklime reacts with water to form slaked lime, and its aqueous solution is known as lime water.

Answer 1

The Correct Option is D

Step 1: Understand lime water.
Lime water is a dilute aqueous solution of calcium hydroxide ${Ca(OH)2}$.
Step 2: Analyze each reaction.
(A) Produces calcium chloride and ammonia, not lime water.
(B) Forms calcium silicate, a solid compound.
(C) Produces calcium carbonate, which is insoluble in water.
(D) Reaction of quicklime ${CaO}$ with water produces calcium hydroxide, which on dissolution forms lime water.
Step 3: Conclusion.
Only reaction (D) leads to the formation of lime water.