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A shiny brown colored element ‘x’ on heating in air becomes black in color. Can

you predict the element ‘x’ and the black colored substance formed? How do you
support your prediction?


The shiny brown coloured element 'X' is copper and the black coloured compound formed is Copper oxide. The reaction involved is 
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The brown coloured element is copper. by the experiment of oxidation we will observe black color copper oxide.
this is in the presence of heat
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