Question

When a piece of magnesium ribbon is placed in a beaker of copper sulfate solution, which one of the following is most likely to happen?

• A. A vigorous reaction immediately takes place, with the release of a lot of heat.
• B. The blue colour of the copper sulfate solution gets darker.
• C. The blue colour of the copper sulfate solution gets lighter.
• D. The magnesium catches fire.

Answer 1

Answer: (C)

The blue colour of the copper sulfate solution gets lighter.

$Mg+CuS{O}_4⟶MgS{O}_4+Cu$

$\left(Blue\right)$

By adding$Magnesium$ to $CuS{O}_4$, it turns to $MgS{O}_4.$

Because $Mg$ is above $Cu$ in reactivity series. So $Mg$ displaces $Cu$ in $CuS{O}_4$. As reaction processes, $CuS{O}_4$ content decreases.

$\therefore$ Color blue fades.