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?
check all that apply.
dioxide sio2
iodide nai
chloride mgcl2
tribromide pbr3

Sodium iodide NaI  

Magnesium chloride MgCl₂

Explanation:

Silicon dioxide SiO₂ it is not soluble in water, so it can not be recrystallized from water, it is a white solid and the boiling point is 2230 °C. This one is not the unknown solid.

Sodium iodide NaI it is soluble in water, it has a white color and the boiling point is 1304 °C . This can be the unknown solid.

Magnesium chloride MgCl₂ is soluble in water, it have a white color and the boiling point is 1,412 °C . This can be the unknown solid.

Phosphorus tribromide PBr₃ is will start a hydrolysis reaction in water, it is a colorless liquid and it has a boiling point of 173 °C. This one is not the unknown solid.

your parents i think this could be it