Question

A shiny brown coloured elements X on heating in air becomes black in colour. Name the element X and the black coloured compound formed.

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Answer 1

x is Iron

black element is Iron oxide

Answer 2

Answer:

The shiny elements are metals. The brown coloured metal is copper. Hence

′

X

′

is copper and the black coloured compound formed is Copper oxide. The reaction involved is:

2Cu(s)+O 2 (g)→CuO(s)

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