Answer: One allotropic form of an element X is a colorless
Chapter 8, Problem 8.138(choose chapter or problem)
One allotropic form of an element X is a colorless crystalline solid. The reaction of X with an excess amount of oxygen produces a colorless gas. This gas dissolves in water to yield an acidic solution. Choose one of the following elements that matches X: (a) sulfur, (b) phosphorus, (c) carbon, (d) boron, and (e) silicon.
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