Question

You are analyzing a solid isolated from a reaction and find that its boiling point is over 1000 ∘C. You dissolve the compound in water solution and recrystallize it to produce some solid crystals that you use to determine that the compound is a crystalline solid. Which of the following could be the identity of the unknown solid?
Phosphorus tribromide PBr3
Silicon carbide SiC
Sodium iodide NaI
Iron (II) chloride FeCl2
thank you

Answer 1

Both NaI and FeCl2 boil above 1000 C but FeCl2 is difficult (if not impossible) to recrystallize from H2O; therefore, I would go with NaI.

Answer 2

There are actually 2 answers to this question. So, you don't have to pick just one.

Answer 3

Silicon carbide SiC

Answer 4

sodium iodide
MgCl2

Answer 5

The answer is NaI & FeCl2.

Answer 6

Beryllium Fluoride BeF2
Magnesium Chloride MgCI2

Answer 7

Fecl2 and Bef2