Q7 / 160 · AP EAMCET 2020 (22 Sep Shift 2) · Chemistry

Which halogen can be oxidised by concentrated nitric acid?

  • A
    Fluorine
  • B
    Chlorine
  • C
    Bromine
  • Correct answer
    D
    lodine

Solution

Reducing properties increase from fluorine to iodine, so it is oxidised by nitric acid. $$ \mathrm{I}_2+10 \mathrm{HNO}_3 \longrightarrow 2 \mathrm{HIO}_3+10 \mathrm{NO}_2+4 \mathrm{H}_2 \mathrm{O} $$ Nitric acid oxidises iodine to iodic acid, $\mathrm{HIO}_3$ and not periodic acid $\mathrm{HIO}_4$, which is of a higher oxidation state. Hence, option (4) is the correct.

Hence, the correct answer is option: 'D'.

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