When one volume of the gaseous element, $X_2$, reacts with the same volume of gaseous hydrogen, two volumes of a gaseous hydride are produced. What formula does the hydride of X have?
- A$\text{H}_2\text{X}$
- B$\text{HX}$
- C$\text{HX}_2$
- D$\text{H}_2\text{X}_2$