Which one of the following will NOT produce carbon dioxide on reacting with an aqueous solution of hydrochloric acid ?
Limestone
Quick Lime
Chalk
Marble
Answer is Wrong!
Answer is Right!
This question was previously asked in
UPSC NDA-1 – 2019
Quick Lime is calcium oxide (CaO). Calcium oxide is a basic oxide. When it reacts with water, it forms calcium hydroxide (Ca(OH)₂, slaked lime). Calcium hydroxide then reacts with hydrochloric acid in a neutralization reaction: Ca(OH)₂(aq) + 2HCl(aq) → CaCl₂(aq) + 2H₂O(l). This reaction produces calcium chloride (a salt) and water, but no carbon dioxide. Alternatively, if CaO reacts directly with HCl without forming Ca(OH)₂ first (e.g., if HCl solution is added directly to solid CaO), the reaction is CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l), again producing salt and water, but no CO₂.