Which of the following statements with regard to the reaction given below are <strong>CORRECT</strong>?<br><br>CaO(s) + H_2O(l) \rightarrow Ca(OH)_2(aq) + Heat<br><br>1. Quicklime is used for whitewashing of walls.<br>2. The solution of slaked lime is used for whitewashing of walls.<br>3. CaO reacts slowly with CO_2 in air to form a thin layer of CaCO_3 on walls.<br>4. Calcium hydroxide called 'slaked lime' is an inorganic compound.<br>Select the <strong>CORRECT</strong> answer using the code given below.
- A. 1 and 4 only
- B. 2 and 4 ✓
- C. 2 and 3
- D. 1, 3 and 4
Correct Answer: B. 2 and 4
Explanation
Slaked lime (Ca(OH)_2) is an inorganic compound used for whitewashing walls, not quicklime (CaO). It is the slaked lime that reacts slowly with ambient CO_2 to form calcium carbonate (CaCO_3).
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