A student carried out an investigation on the chloride of a Period 3 element. The student recorded the following observations. "The substance was a white, crystalline solid. It dissolved readily in water to form a solution with pH $12$. When it was put into a test-tube and warmed in a roaring Bunsen flame, the substance only melted after several minutes of heating." What can be inferred from this record?
- AAt least one of the recorded observations is incorrect.
- BThe compound was magnesium chloride, $\text{MgCl}_2$.
- CThe compound was phosphorus pentachloride, $\text{PCl}_5$.
- DThe compound was sodium chloride, $\text{NaCl}$.