when K₂Cr₂O₇ dissolves in water, the following equilibrium is established
Cr₂O₇^-2(aq)+H₂(l) → 2CrO₄²(aq) orange yellow
start the colour observed on adding a few drops dilute H₂SO₄ to the system

• A.orange
• B.yellow
• C.pink
• D.colourless