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Q.

A shiny brown colored element “X” on heating in air becomes black in colour. The element X and the black colored substance formed are?


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a

Zinc, Copper oxide   

b

Aluminium, Sulphur oxide   

c

Copper, Copper oxide   

d

Copper, Sulphur oxide 

answer is C.

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Detailed Solution

Copper is the metal that has a gleaming brown colour. When copper is heated in the air, it combines with oxygen in the air to generate copper oxide, which is black in colour.
2Cu(s) + O2(g) → 2CuO(s)
 
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