Question

Write the ionic equation representing the oxidising nature of K₂Cr₂O₇ in an acidic medium.

Answer 1

In an acidic medium, the dichromate ion acts as an oxidising agent by being reduced from Cr(VI) to Cr(III). The ionic equation is:

\[\ce{Cr2O^{2-}_7 + 14H+ + 6e- -> 2Cr^{3+} + 7H2O}\]