Question

9. You might have noted that when copper powder
is heated in a china dish, the surface of copper
powder becomes coated with a black colour
substance.
(a) How has this black coloured substance
formed?
(b) What is that black substance?
(c) Write the chemical equation of the reaction
that takes place.
[CBSE 2011]​

Answer 1

ⓣⓗⓐⓣ ⓑⓛⓐⓒⓚ ⓢⓤⓑⓢⓣⓐⓝⓒⓔ ⓘⓢ ⓒⓐⓡⓑⓞⓝ...

ⓕⓞⓡⓜⓤⓛⓐ. ⓒ

ⓕⓞⓡⓜⓔⓓ ⓑⓔⓒⓐⓤⓢⓔ ⓞⓕ ⓒⓔⓡⓣⓐⓘⓝ ⓡⓔⓐⓒⓣⓘⓞⓝⓢ ⓑⓔⓒⓐⓤⓢⓔ ⓞⓕ ⓗⓔⓐⓣ