The Engineering Projects

Got this question on my Grade 11 Chem Test (Chemical Bonding, Matter, etc)

It was a multiple choice. These are the answers I remember:

Red yellowish gas
Black powdery solid
Clear crystal
Grey metal

One or two other answers but I forgot (Don't have the test back yet). I assume it was just testing our knowledge on similar properties. The properties in the answers are in reference to other chemicals (Ex. Black powdery solid - Lead).

What would the answer most likely be?

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