Q60 (2024)
In a test tube containing a salt, a few drops of dilute $H_2SO_4$ was added, which gave colourless vapours having the smell of vinegar. The vapours turned the blue litmus paper red. Identify the correct anion from the following:
- (1) Acetate, $CH_3COO^-$
- (2) Carbonate, $CO_3^{2-}$
- (3) Sulphate, $SO_4^{2-}$
- (4) Sulphide, $S^{2-}$
### Related Formula
$$CH_3COO^- + H^+ \rightarrow CH_3COOH(g) \quad (\text{vinegar smell})$$
### Core Logic
Reaction of salt with dilute $H_2SO_4$ liberating acidic acetic acid vapours ($CH_3COOH$) indicates the presence of Acetate ion ($CH_3COO^-$).
### Step 1: Conclusion
Anion is Acetate ($CH_3COO^-$).
### Pattern Recognition
Vinegar smell + dil $H_2SO_4$ reaction is the characteristic test for acetate ions.
### Evaluation Rubric / Model Answer
null
### Chapter Mix
Class 11 Chemistry: Practical Chemistry
