Chemistry - Complete d-block Question with Solution | TestHub

Cu⁺ is unstable in aqueous solution due to disproportionation reaction:

$$2C{u}^{+}\to C{u}^{2+}+Cu$$

Hence, Cu⁺ does not exist in aqueous solution. (A) Correct

V₂O₅ shows both acidic and basic nature, so it is an amphoteric oxide. (B) Correct

Aqueous solution of Cr³⁺ is violet/green due to hydration and complex formation, not yellow. Hence, (C) Incorrect

Chromium forms compounds in higher oxidation states, and CrF₆ (chromium(VI) fluoride) can be formed. (D) Correct

Correct Answer: (A), (B) and (D)