Question

Copper(II) carbonate when heated turns: 

Options

• pale yellow

• black

• reddish brown

• blue

Answer 1

Black

Explanation:

When light-green copper(II) carbonate (\(\text{CuCO}_{3}\)) is heated, it undergoes thermal decomposition to produce copper(II) oxide (\(\text{CuO}\)), which leaves behind a distinct black solid residue:

\(\text{CuCO}_{3}\xrightarrow{\Delta }\text{CuO\ (black)}+\text{CO}_{2}\uparrow \)