Question

In aqueous solution Cu(+1) salts are unstable because

• A. Cu(+1) has 3d$^{10}$ configuration.
• B. They disproportionate easily to Cu and Cu$^{2+}$ states.
• C. They disproportionate easily to Cu$^{2+}$ and Cu$^{3+}$ states.
• D. Its change in free energy is zero

Hint:

Disproportionation reactions involve the same element undergoing simultaneous oxidation and reduction.

Answer 1

The Correct Option is B

Cu$^+$ is unstable in aqueous solution and undergoes disproportionation: \[ 2Cu^+ \rightarrow Cu^{2+} + Cu \] This makes Cu$^+$ salts unstable due to their tendency to convert into Cu and Cu$^{2+}$.