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Question

Which of the following is not an element?


A

Graphite

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B

Germanium

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C

Silica

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D

Silicon

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Solution

The correct option is C

Silica


Explanation for correct option:

C. Silica

Elements:

  • “An element is a basic form of matter that cannot be broken down into simpler substances by chemical reactions.”
  • Elements can be metals/non-metals/metalloids.
  • Examples of elements are Iron Fe, Sodium Na, or Gold Au.

Silica:

  • Silica is not an element rather it is a compound that is composed of silicon and oxygen atoms.
  • The chemical formula of silica is SiO2.
  • Silica is chemically known as Silicon dioxide.

Explanation for incorrect options:

A. Graphite is a chemical element that is made up of carbon.

B. Germanium is a chemical element with an atomic symbol Ge.

D. Silicon is a chemical element having an atomic symbol Si.

Hence, the correct option is C i.e. Silica.


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