Find the average oxidation number of iodine in the triiodide ion, I3-. Give the answer to two decimal places (include the sign).

JEE Main levelNumerical answerDifficulty 2 of 3rx027

Find the average oxidation number of iodine in the triiodide ion, $I X_{3} X^{-}$ . Give the answer to two decimal places (include the sign).

Numerical answer type, tolerance 0.005.

For the ion,

3 x = - 1

gives

x = - 1/3 = - 0.333

. Rounded to two decimals:

- 0.33