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NTA Abhyas JEE Main2020ChemistryPractical ChemistryPractice

Which salt on heating with conc. H 2 S O 4 gives violet vapours?

Options

  1. AIodide
  2. BNitrate
  3. CSulphate
  4. DBromide

Correct answer

A. Iodide

Step-by-step solution

K I + H 2 S O 4 C o n c . → Δ K H S O 4 + H I conc . H 2 SO 4 + 2HI → 2H 2 O + I 2 + SO 2 Violet vapours

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