Question

An element x reacts with air to form black colour compound.Name the element X and black colour compound form.​

Answer 1

X' is copper (Cu) and the black-coloured compound formed is copper oxide(CuO).

its in the ncert 10 book.

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Answer 2

ELEMENT X IS Cu

BLACK SUBSTANCE IS CuO

This the reaction

2Cu + O2 --------> 2CuO

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