Question

On heating a reddish brown metal 'X' in sufficient supply of oxygen , a black coating is obtained on its surface ,identify 'X' , write the chemical equation of above reaction, is the element 'X' is oxidized or reduced

Answer 1

A reddish brown metal X on heating forms a black coating of oxide Y on its surface.The metal does not react with dil.HCl and dil.H2SO4.It reacts with hot conc.H2SO4 to givea pungent smelling gas similar to that produced by burning matchstick.The metal oxide react with dil.H2SO4 to form a blue solution Z.Identify 'X' 'Y' 'Z' and write chemical reaction involved.The metal reacts with dil.HNO3 to liberate colourless and odourless gsa A and with conc.HNO3 its liberates a brown gas B.Identify 'A' and 'B' also

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Answer 2

X is Copper

2Cu + O2 ----> 2CuO

Here copper is oxidized as oxygen is added to it.

The black compound formed is Copper Oxide.

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