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Which of the following reacts most slowly with nitric acid?

1. Phosphorus
2. Chlorine
3. sulphur
4. lodine

Correct answer: lodine

Solution

Iodine is the least reactive among the given nonmetals, so it is oxidized by nitric acid more slowly than phosphorus or sulfur. Chlorine is already highly electronegative and does not react in the same straightforward way, but among the listed choices the slowest reacting substance is iodine.

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