Chemistry · chapter PYQs

Principles Related to Practical Chemistry, on the exam screen.

1 question from NEET 2026, 1 minute, marked +4 / −1. See them with solutions.

Principles Related to Practical Chemistry · PYQs

Candidate: You

Time Left

Q1/1

Question 1 · NEET 2026 · Q77 · +4 / −1
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:
Answer and explanation
Answer: (3)
A colourless acidic vapour with the smell of vinegar indicates acetic acid: acetate salts react with dilute H $_{2}$ SO $_{4}$ to liberate CH $_{3}$ COOH (vinegar odour), which turns blue litmus red. Sulphide would give rotten-egg-smelling H $_{2}$ S, carbonate gives odourless CO $_{2}$ (which turns lime water milky), and sulphate evolves no gas with dilute H $_{2}$ SO $_{4}$ .