1.

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 :Here, element .X. is COPPER (CU). When it is HEATED in air, it forms black coloured copper OXIDE (CuO).
For example
`underset("Brown Coloured shiny element")(2Cu)+O_(2) overset(Delta)to underset("Black coloured compound")(2CuO)`
In this reaction, Cu is oxidised to CuO.


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