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A shiny brown coloured element 'X' on heating in air becomes black in colour. Name the element 'X' and the black coloured compound formed.

Answer»

Solution :The BROWN coloured element .X. is COPPER. On HEATING in air it FORMS copper oxide which is black in colour.
`UNDERSET("(Brown colour)")underset("Copper")(2Cu(s))+underset("Oxygen")(O_(2)(g))tounderset("(Black)")underset("Copper oxide")(2CuO(s))`


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