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CBSE Class 10 Science 2017 Delhi Term II Set 1 Paper

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Question : 34 of 36
Marks: +1, -0
A gas is liberated immediately with a brisk effervescence, when you add acetic acid to sodium hydrogen carbonate powder in a test tube. Name the gas and describe the test that confirms the identity of the gas.
Solution:  
CH3COOH+NaHCO3→CH3COONa+CO2+H2O\mathrm{CH}_3 \mathrm{COOH} + \mathrm{NaHCO}_3 \rightarrow \mathrm{CH}_3 \mathrm{COONa} + \mathrm{CO}_2 + \mathrm{H}_2 \mathrm{O}
Gas evolved is CO2\mathrm{CO}_2. It is tested by passing CO2\mathrm{CO}_2 in lime water which turns milky due to formation of insoluble CaCO3\mathrm{CaCO}_3.
Ca(OH)2+CO2→CaCO3↓+H2O\mathrm{Ca}(\mathrm{OH})_2 + \mathrm{CO}_2 \rightarrow \mathrm{CaCO}_3 \downarrow + \mathrm{H}_2 \mathrm{O}
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