Question

# Metallic solids are always opaque because:(A) They reflect all the incident light(B) They scatter all the incident light(C) The incident light is readily absorbed by the free electrons in a metal(D) The energy band traps the incident

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Hint: ‘Opaque’ word is used for materials which can reflect and absorb all the incident light falling on it. The metals exist in a structure where the atoms are embedded in a sea of free electrons.

-A metal is a substance that has a lustrous appearance, is a good conductor of electricity and heat. It conducts electricity due to the presence of free electrons in it. Also metals have the ability to lose electrons and form cations or undergo oxidation while reducing others. They react with oxygen in the atmosphere to form metal oxides like ZnO, $C{u_2}O$, $Ti{O_2}$, etc which are basic in nature.