Question

In the reaction of hydrogen with iodine

Answer 1

I don't really know what you were asking; would you mind please clarifying? :)

Explanation:

From what I'm guessing from the question is, "Iodine, and hydrogen combine to form hydrogen iodide. In the reverse reaction, hydrogen iodide decomposes back into hydrogen and iodine."

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Answer 2

HI hydrogen iodide

Explanation:

H2(gas)+I2(gas)---------->2HI(gas)