Question

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Answer 1

1The substance x is copper    and y is copper oxide

2--In first it is a combination reaction and in second it is redox reaction..

3-- Cu+O2------>2cuo
  Cuo+h2___------> Cu +h2

4.As iron left exposed to air it corrodes as it reacts with its atmosphere....Same as iron,copper also reacts with its surrounding and form a shiny green layer called patina

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Answer 2

a)  X = Copper [ Cu ]
     Y = Copper Oxide [ CuO ]

b) Oxidation and Reduction.

c) 2Cu + O2 ----------> 2CuO.
    2CuO + 2H2 -----------> 2Cu + 2H2O.

d) Copper turn green when exposed to wind forming a thin green layer called Patina.


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