Correct option is C
The correct answer is(c) CO₂, CaCO₃, Ca(HCO₃)₂.
Explanation:
When limestone (calcium carbonate, CaCO₃) reacts with dilute hydrochloric acid (HCl), carbon dioxide (CO₂) gas is produced.
This gas, when passed through lime water (a solution of calcium hydroxide, Ca(OH)₂), forms a white precipitate of calcium carbonate (CaCO₃).
If excess CO₂ is passed through the solution, the calcium carbonate dissolves, forming a soluble compound calcium bicarbonate (Ca(HCO₃)₂).
Information booster:
CO₂, CaCO₃, Ca(OH)₂
- CO₂: This is the gas produced when limestone reacts with dilute HCl, as expected.
- CaCO₃: This is the white precipitate formed when CO₂ is passed through lime water.
- Ca(OH)₂: This is lime water, which is a solution of calcium hydroxide.
CO₂, CaCO₂, CaO
- CO₂: Again, this is the gas produced during the reaction between limestone and HCl.
- CaCO₂: This compound doesn’t exist. The correct compound is calcium carbonate (CaCO₃), which is the white precipitate formed in lime water.
- CaO: This is calcium oxide, also known as quicklime.
CO₂, Ca(HCO₃)₂, CaCO₃
- CO₂: This is correct as the gas produced during the reaction with HCl.
- Ca(HCO₃)₂: This is calcium bicarbonate.
- CaCO₃: This is the white precipitate that forms when CO₂ is bubbled through lime water, but the reaction with excess CO₂ leads to the dissolution of this precipitate,.
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