Which one of the following is a non-metallic material?

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Lead

Copper

Tin

Limestone

answer is D.

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Detailed Solution

Limestone is a non-metallic mineral in the given options.
Non-metals are minerals (Non-metallic minerals) that, as a rule, do not serve as raw materials for the extraction of metal. The group of nonmetals, widespread amongst various minerals, is of great economic significance. Limestone is associated with rocks composed of calcium carbonate or the double carbonate of calcium and magnesium. It is found in sedimentary rocks of most geological formations. Metallic minerals, as the name suggests, are minerals containing one or more metals. These usually occur as mineral deposits and are excellent heat and electricity conductors. Major metallic minerals like tin, copper, zinc, lead, etc., are obtained from veins and lodes.

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