MCQ
Ammonia with Cu ion forms complex ion $[Cu(NH_{3})_{4}]^{2+}$ in basic solution but not in acidic medium?
- AIn acidic solution protons with ammonia molecules forms $NH_{4}^{+}$ and $NH_{3}$ molecule is unavailable
- BIn basic solution insoluble $Cu(OH)_{2}$ is precipitated which dissolved in presence of base
- CCopper hydroxide is amphoteric substance
- DIn acidic solution, hydrated copper is protected