The electric bulb on long use forms a black coating on its inner surface. The process is associated with

melting of tungsten

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sublimation of tungsten

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reduction of tungsten

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condensation of tungsten

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Solution

The correct option is B
sublimation of tungsten
Due to the constant heating of the tungsten (filament), it sublimates and forms a black coating on the inner surface of the bulb over long time use.

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