Question

What is deposited on the walls after whitewashing?

• A. CaCO\(_3\) (Calcium carbonate)
• B. Ca(OH)\(_2\) (Calcium hydroxide)
• C. CaO (Calcium oxide)
• D. CaSO\(_4\) (Calcium sulphate)

Hint:

Remember that the process of whitewashing involves the formation of calcium hydroxide initially, which then reacts with carbon dioxide to form calcium carbonate on the walls.

Answer 1

The Correct Option is A

Step 1: Whitewashing Explained
Whitewashing uses calcium hydroxide (Ca₂OH₂). This substance reacts with air's carbon dioxide to create calcium carbonate (CaCO₃), which coats the walls. The reaction is:

 Ca(OH)2 + CO2 → CaCO3 + H2O
 

Step 2: Summary
Whitewashing results in calcium carbonate (CaCO₃) being deposited on the walls.
Conclusion:

CaCO₃ (Calcium carbonate)