Question

Black copper (II) oxide dissolves in colourless sulfuric acid to give:

• A. yellow solution of copper (II) sulfate
• B. blue solution of copper (II) sulfuric acid
• C. blue solution of copper (II) sulfate
• D. none of above

Answer 1

The correct option is C blue solution of copper (II) sulfate

$Cu\left(II\right)oxide⟶CuO$

$CuO+H_{2}S{O}_4⟶\underset{\left(Bluecoloured\right)}{\underset{}{CuS{O}_4}}+H_{2}O$

Copper(II) oxide, a black solid and colourless dilute sulfuric acid react to produce copper(II) sulfate, giving a characteristic blue colour to the solution.

Hence, the corret option is $C$