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An organic compound X of molecular formula C2H4O2 turns blue litmus to red and gives brisk effervescence with Na2CO3 and NaHCO3. Identify X and name of the gas responsible for effervescence.

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X is ethanoic acid (CH3COOH). It is acidic and hence turns blue litmus red. It releases carbon dioxide (CO2) when treated with Na2CO3 and NaHCO3 which is responsible for effervescence. 

2CH3COOH + Na2CO3→ 2CH3COONa + CO2↑ + H2

CH3COOH + NaHCO3→ CH3COONa + CO2↑ + H2O

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