Question

Concentrated HNO₃ reacts with iodine to give ______.

Options

• HI, NO₂ and H₂O

• HIO₂, N₂O and H₂O

• HIO₃, NO₂ and H₂O

• HIO₄, N₂O and H₂O

Answer 1

Concentrated HNO₃ reacts with iodine to give HIO₃, NO₂ and H₂O.

Explanation:

When concentrated nitric acid reacts with iodine, it acts as a strong oxidising agent and oxidises iodine to iodic acid (HIO₃). Simultaneously, nitric acid itself gets reduced to nitrogen dioxide (NO₂) and water is also formed.

The balanced equation is:

\[\ce{I2 + 10HNO3 -> 2HIO3 + 10NO2 + 4H2O}\]

Thus, the products are HIO₃, NO₂ and H₂O.