Chapter 1: Chemical reactions and equations

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Chemical reactions and equations

Question:

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:

Copper is the element that has a shiny brown coloured appearance. So, ‘X’ is Copper. When copper is heated in air, it becomes black in colour due to the formation of copper oxide. This is a type of oxidation reaction in which the copper gains oxygen to form copper oxide.

2Cu (s) + O2 (g) → 2CuO (s)

Thus, ‘X’ is Copper and Copper oxide is black coloured compound.


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