Which word does NOT belong with the others in the group: {Oxygen, Nitrogen, Argon, Water}?
Answer and explanation
Correct answer: B. Water
- Step 1: Oxygen, Nitrogen, and Argon are chemical elements (and gaseous elemental substances at room temperature).
- Step 2: Water () is a chemical compound consisting of bonded hydrogen and oxygen atoms, making it fundamentally different.
Answer
Water.
Why not the others: 'Oxygen' is a pure element; 'Nitrogen' is a pure element; 'Argon' is a noble gas element.
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