Question

what will you observe:
(a) when iodine and phosphorus in their solid state​

Answer 1

Answer:

Phosphorus triiodide (PI3) is an unstable red solid which reacts violently with ... Note that phosphorus also forms a lower iodide, P2I4, but the existence of PI5 is ... See also[edit].

Answer 2

Explanation:

Phosphorus triiodide (PI3) is an unstable red solid which reacts violently with water. It is a common misconception[1] that PI3 is too unstable to be stored; it is, in fact, commercially available. It is widely used in organic chemistry for converting alcohols to alkyl iodides. It is also a powerful reducing agent. Note that phosphorus also forms a lower iodide, P2I4, but the existence of PI5 is doubtful at room temperature.

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