A student studied the chloride of a Period 3 element. The compound appeared as a white crystalline solid. It dissolved readily in water to produce a solution of $\text{pH }12$. When it was put into a test-tube and heated in a roaring Bunsen flame, the compound melted after several minutes of heating. What conclusion can be drawn from these observations?
- 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, $\text{NaCl}$.