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Question

Is there any non metal in solid state that does not exhibit any colour i.e. is black or white in colour?

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Solution

Seventeen elements are generally classified as nonmetals; most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine), and a few are solids (carbon, phosphorus, sulfur, selenium, and iodine).
Phosphorus exists in at least 3 allotropic forms. The three main allotropes are named for their colors: white (or yellow) phosphorus, red phosphorus, and black phosphorus. The most common and reactive of which is white (or yellow) phosphorus which looks like a waxy, transparent solid with a garlic-like odor.
Colour of carbon are black (graphite), transparent(diamond)

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