A water-insoluble calcium compound (a) on reacting with dil. H2so4 released a colourless and odourless gas (b) with brisk effervescence. When gas (b) was passed through lime water, the lime water turned milky and again formed compound a. Identify a and b and write the chemical equations for the reactions involved.
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15
Answer:
A CaCO₃ B CO₂
Explanation:
CaCO₃ + H₂SO₄ --------------> CaSO₄ + CO₂ + H₂
Ca(OH)₂ + CO₂ -----------------> CaCO₃ + H₂O
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(a). The water insoluble calcium compound a is calcium carbonate ( CaCO₃ ) .
(b). The gas evolved when calcium carbonate is treated with H₂SO₄ , b is carbon dioxide ( CO₂ ) .
The chemical equations of the two reactions are -
CaCO₃ + H₂SO₄ → CaSO₄ + CO₂ + H₂
Ca(OH)₂ + CO₂ → CaCO₃ + H₂O
- Calcium carbonate ( CaCO₃ ) is used as an antacid .
- Carbon dioxide is used for cooling and refrigeration . It acts as a greenhouse gas .
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