Question

a shiny brown coloures​

Answer 1

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)

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:

′ 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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