A white precipitate is formed when gas A bubbled through slaked lime solution and the precipitate dissolves on prolonged bubbling of gas B. White precipitate reappears on heating the solution with evolution of A. Find the gases A and B.

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A white precipitate is formed when gas A bubbled through slaked lime solution and the precipitate dissolves on prolonged bubbling of gas B. White precipitate reappears on heating the solution with evolution of A. Find the gases A and B.

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CO and CO₂

CO₂ and CO

CO₂ and CO₂

CO and CO

answer is D.

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Detailed Solution

$\begin{array}{l} Ca {(OH)}_{2 (aq)} + {CO}_{2 (g)} \to \underset{(A)}{{CaCO}_{3 (s)}} + H_{2} O \\ {CaCO}_{3 (s)} + H_{2} O + {CO}_{2 (g)} \to Ca {({HCO}_{3})}_{2 (aq)} \\ Ca {({HCO}_{3})}_{2} \overset{Δ}{\to} {CaCO}_{3 (g)} + H_{2} O + {CO}_{2 (g)} \end{array}$