Does ethanol "decompose" or "remove" phosgene from chloroform?
It's a weird way of phrasing it, but I think they are trying to lead you to this

Basically, chloroform is stabilized with ethanol or amylene, but if a sample is dried, it will no longer contain stabilizer. To actually remove phosgene, you can wash it with NaHCO3. This would essentially leave you with entirely harmless products. 

This is my best guess as to what they are trying to get you to understand. Please let me know if this helps.