What is the formula of nitrogen triodide?
$ NI_3$
What color has the gas formed during the explosion?
It is purple.
Give the name and formula of the gas !
Iodine $ I_2$
Write the equation for the reaction!
$ 2NI_3$ $\longrightarrow$ $ N_2$ $ + $ $ 3I_2$.
What kind of reaction is it and why ?!
The compound $NI_3 $ is decomposed into two elementary substances $ N_2$ nitrogen and $ I_2$ iodine. It is an analysis reaction .