Which one among the following is not a mixture? (1) Graphite (2) Glass (3) Brass (4) Steel

Which one among the following is not a mixture? (1) Graphite (2) Glass (3) Brass (4) Steel
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(1) Graphite Explanation: Graphite is a naturally-occurring form of crystalline carbon. It is a native element mineral found in metamorphic and igneous rocks. Graphite is a mineral of extremes.
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