# Which material would be totally involatile?

## $\text{i. camphor;}$ $\text{ii. graphite;}$ $\text{iii. ammonium chloride;}$ $\text{iv. iodine?}$

$\text{Graphite is the only contender..........}$
Graphite is the only material that is NON-MOLECULAR; camphor, and iodine are molecular. Ammonium chloride is a salt, that could be decomposed with heating to give $N {H}_{3} \left(g\right)$ and $H C l \left(g\right)$, but this would recombine as the salt on cooling.