On addition of conc. H 2 SO 4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

Question

Philoid · Accepted Answer

On addition of concentrated H₂SO₄ to iodide salt violet fumes comes out because HI formed during the reaction react with oxygen present in the atmosphere to form I₂ which is violet in colour.

2NaCl + H₂SO₄ Na₂SO₄ + 2HCl

HCl produced during the reaction is colourless and pungent smelling gas.

2NaI + H₂SO₄ Na₂SO₄ + 2HI 2H₂O + SO₂ +I₂

Thus the halogen acid(HI) obtained in this reaction is oxidized to form I₂.

Hence the correct option is (iii).

On addition of conc. H2SO4 to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because

On addition of conc. H₂SO₄ to a chloride salt, colourless fumes are evolved but in case of iodide salt, violet fumes come out. This is because