Which of the following options contains only elements.

Air, water, oxygen

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Hydrogen, oxygen, brass

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Air, water, iron

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Calcium, sulphur, carbon

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Solution

The correct option is D Calcium, sulphur, carbon
Option A: Only oxygen is an element, the air is a mixture of gases and water is a compound
Option B: Hydrogen and oxygen are elements, but brass is an alloy hence a homogeneous mixture.
Option C: Only iron is an element.
Option D: Calcium, sulphur and carbon are elements and hence the answer.

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