{"knowledge_schema": {"broad_category": "Chemistry \u2192 Chemical Reactions \u2192 Gas Reactions", "refinement": "This problem involves understanding the reactions between compounds and the properties of the resulting gases and solids.", "specific_scope": "The focus is on the reaction of compound X with gas Y to form solid Z, and the subsequent reaction of Z with water to produce gas W and a strong acid, with an emphasis on determining the molecular geometry of gas W.", "goal": "Identify the molecular geometry of gas W based on its properties as a greenhouse gas."}, "summary": "This problem explores a chemical reaction where a compound reacts with gas to form a solid, which upon further reaction with water produces a gas and a strong acid. The key focus is on identifying the molecular geometry of the resulting gas, W, which is known to be a greenhouse gas. The answer indicates that W has a linear molecular geometry, which is characteristic of certain greenhouse gases."}