Science
Study the experimental set-up shown in given figure and choose the correct option from the following:
| P | Q | Change observed in calcium hydroxide solution |
|---|---|---|
| 1.K2CO3 | Cl2 gas | No change |
| 2.KHCO3 | CO2 gas | No change |
| 3.KHCO3 | H2 gas | Turns milky |
| 4.K2CO3 | CO2 gas | Turns milky |
Hydrogen Chloride
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Answer
| K2CO3 | CO2 gas | Turns milky |
Reason — The reaction between potassium carbonate and HCl gas produces carbon dioxide gas.
K2CO3 + 2HCl (dil.) ⟶ 2KCl + H2O + CO2
Calcium hydroxide reacts with carbon dioxide gas and forms calcium carbonate, which turns the solution milky.
Ca(OH)2 + CO2 ⟶ CaCO3 + H2O
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