The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Exc

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Q. The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Excess of CO₂ is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X. (B) is

a) CaCO₃

b) Ca(OH)₂

c) Na₂CO₃

d) NaHCO₃

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Step 1. X on heating gives a colourless gas (CO₂) and a residue -- this matches CaCO₃ →(Δ)→ CaO + CO₂, so X = CaCO₃ and the residue is CaO.

Step 2. The CaO residue dissolves in water to give (B): CaO + H₂O → Ca(OH)₂, so B = Ca(OH)₂.

Step 3. Excess CO₂ bubbled through aqueous Ca(OH)₂ gives soluble calcium hydrogen carbonate (C): Ca(OH)₂ + 2CO₂ → Ca(HCO₃)₂ (via the intermediate CaCO₃ + CO₂ + H₂O → Ca(HCO₃)₂), so C = Ca(HCO₃)₂. …

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Q.The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Excess of CO₂ is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X. (B) is

Concept understanding — Calcium Hydroxide (Slaked Lime)

Q.The compound (X) on heating gives a colourless gas and a residue that is dissolved in water to obtain (B). Excess of CO₂ is bubbled through aqueous solution of B, C is formed. Solid (C) on heating gives back X. (B) is

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