Which one of the following is not a compound?

Marble

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Ozone

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Carborundum

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Quicklime

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Solution

The correct option is B Ozone
$O_{3} (ozone)$ consists of only one kind of atom oxygen. The structure formed by only one type of atom is called a molecule not compound.

A compound is a combination of more than one element.

Marble, $C a C O_{3}$ is made by the combination of calcium, carbon and oxygen.

Carborundum, $S i C$ is a compound and quicklime, $C a O$ is also compound.

Hence, the answer is option $B$ .

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