Four students observed the colour and odour of acetic acid and its reaction with sodium hydrogencarbonate. They tabulated their observations as given below.
Student
| Colour of acetic acid | Odour of acetic acid | Action with sodium hydrogencarbonate |
| ABCD | bluecolourlesslight greenlight brown | fruitysmell of vinegarodourlessrotten eggs | gas evolves without bubbleseffervescencegas evolves without bubbleseffervescence |
The correct set of observation is that of student:
(1)A
(2) B
(3)C
(4) D"
Correct answer: (2) B
Explanation: Ethanoic acid (acetic acid) is colourless having a smell of vinegar. On reacting with sodium hydrogencarbonate, it produces carbon dioxide with effervescence.
The chemical equation for the reaction is given below:
$CH_3COOH (aq) + NaHCO_3 (aq) → CH_3COONa (aq) + H_2O(l) + CO_2 (g)$
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