A sample of pure substance will be "a test tube of zinc oxide".
A pure substance is one that, like water, air, or nitrogen, does have a consistent chemical makeup throughout. A substance can be pure even if it contains more than one ingredient or compound. Tin, sulfur, diamond, water, pure sugar (sucrose), table salt (NaCl), as well as baking soda are examples of pure substances (sodium bicarbonate). In general, crystals represent unadulterated material. Illustrations of pure substances that seem to be chemical elements include tin, sulfur, and diamond.
Zinc oxide would be a colorant as well as a bulking agent. It serves as a sunscreen or skin protectant including over medicinal products. By diffusing as well as reflecting UV rays, zinc oxide serves as just a sunscreen.
Therefore, it can be understood that a sample of pure substance will be "a test tube of zinc oxide".
Hence, the correct answer will be option (A)
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