Which one among the following is not a mixture? A. Graphite B. Glass C. Brass D. Steel

The correct answer is: A. Graphite

Graphite is a pure element, while the other options are all mixtures.

• Graphite is a crystalline form of carbon that is naturally occurring. It is a soft, black, and slippery substance that is used in a variety of applications, including pencils, lubricants, and batteries.
• Glass is an amorphous solid, meaning that it does not have a regular crystal structure. It is made by melting silica sand and other materials, and then cooling it rapidly. Glass is transparent, hard, and brittle.
• Brass is an alloy of copper and zinc. It is a strong, durable metal
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  that is used in a variety of applications,
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  including plumbing fixtures, musical instruments, and jewelry.
• Steel is an alloy of iron and carbon. It is a strong, versatile metal that is used in a variety of applications, including construction, machinery, and automobiles.