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Question

Which of the following substance is made up of only one element?

A
Diamond
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B
Glass
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C
Marble
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D
Sand
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Solution

The correct option is A Diamond
Diamond is an allotrope of carbon and is therefore, made up of one element, carbon. Glass, on the other hand, is mainly composed of silica and sodium carbonate. Marble is mainly calcium carbonate and sand is composed of silicon dioxide.

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