Raw Materials Classification in Contact Process

Steps:

• The three raw materials are sulfur, air, and water.
• Sulfur is an element (pure substance of one type of atom).
• Air is a mixture (gases like nitrogen, oxygen, and others).
• Water is a compound (H₂O, two or more elements chemically bonded).

Why C is correct:

• C (1 element, 1 compound, 1 mixture) matches the classifications: sulfur (element), water (compound), air (mixture).

Why the others are wrong:

• A (0 3 0): Ignores sulfur as element and air as mixture.
• B (1 2 0): Treats air as compound, but it is a mixture.
• D (2 0 1): Counts water as mixture, but it is a compound.

Final answer: C