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Periodic classification of element

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  1. Which among the following is an element?
    1. Alumina
    2. Brass
    3. Graphite
    4. Silica
Correct Option: C

Graphite is an allotrope of carbon. Alumina (Al2O3) and silica (SiO2) are oxides and Brass is an alloy of Cu and Zn.


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