Acetic add reacts with solid sodium hydrogen carbonate,(a) Slowly forming no gas (b) Vigorously with effervescence(c) Slowly without effervescence (d) Vigorously without gas formation

Correct answer: (b) Vigorously with effervescence

Explanation: Acetic acid reacts with solid sodium hydrogen carbonate vigorously and effervescence is produced due to the evolution of CO₂ gas. The equation for the reaction is given below:

$ CH_3COOH + NaHCO_3 → CH_3COONa + H_2O + CO_2$