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Inorganic compounds generally do not have C-H bonds, while organic compounds do have such bonds. The distinction between inorganic and organic chemistry, however, is far from absolute.

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Why is iodine formed when nitric acid reacts with hydroiodic acid?

Nitrate is a strong oxidant which oxidizes the iodide to iodine. $$\ce{NO_3^- + 2I^- + 2H^+\rightarrow NO_2^- + I_2 \uparrow + H2O}$$ Note that the oxidation number of the nitrogen atom in $\ce{NO3- …
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