A shiny brown coloured element X on heating in air becomes black in colour a) Name the element X and the black coloured compound formed b) What happens when hydrogen is passed through that compound?

A shiny brown coloured element X on heating  in air  becomes black in

colour

a) Name the element X  and the black coloured compound formed

b) What happens  when hydrogen is passed through that compound?

c) Write the balanced chemical equations for all the reactions involved.

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