Question

A green powder is heated in a test tube. A gas is given off, and the powder becomes a black solid. In which classification of matter does the green powder belong?

Answer 1

when green powder is heated, it turns black and a gas is produced. in irreversible changes, new materials are always formed. given that a gas is produced, which is a new material, heating green powder is an irreversible change.

Answer 2

$\huge\mathfrak\red{heya\:Mate}$

$\huge\boxed{\fcolorbox{blue}{pink}{Answer}}$

Green compound is :-

$\huge\mathfrak{CuCO3}$

$\huge\mathbb{CuCO3=CuO+CO2 }$