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Which substance is a gas at room temperature and also an element?

Answer and explanation

Correct answer: Oxygen

Oxygen is a gas at room temperature and is an element because it contains only oxygen atoms. Water is a compound, brass is an alloy of copper and zinc, and sodium chloride is also a compound. Exam tip: identify both the physical state and whether a substance is an element, compound, or mixture.

Related tags

ChemistryNature Of MatterChemical ClassificationElementsStates Of MatterClass 11Some Basic Concepts Of ChemistryClass 11 Mcq

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