Q. Consider the following:
  1. Limestone
  2. Mica
  3. Gypsum
  4. Coal
  5. Petroleum
Which of the above are examples of non-metallic minerals?

Answer: 1, 2, 3, 4 and 5
Notes: Non-metallic minerals do not contain metals. Limestone, mica, and gypsum are classic non-metallic minerals. Coal and petroleum, while primarily used as fuels, are also classified as non-metallic minerals because they lack metallic elements. Hence, all items mentioned – limestone, mica, gypsum, coal, and petroleum – are examples of non-metallic minerals.
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