Exams › NEET › Chemistry

In which of the following pairs are both the ions coloured in aqueous solutions?

1. Sc3+, Ti3+
2. Sc3+, Co2+
3. Ni2+, Cu+
4. Ni2+, Ti3+

Correct answer: Ni2+, Ti3+

Solution

Both Ni2+ and Ti3+ ions are coloured in aqueous solutions due to the presence of unpaired electrons in their d-orbitals, which allow d-d transitions. Sc3+ and Cu+ are colourless as they lack unpaired d-electrons.

Related NEET Chemistry questions

• Identify the incorrect statement.
• Which one of the following ions exhibits d-d transition and paramagnetism as well?
• Magnetic moment 2.84 B.M. is given by: (At. nos, Ni = 28, Ti = 22, Cr = 24, Co = 27)
• Magnetic moment 2.83 B.M is given by which of the following ions? (At. nos. Ti = 22, Cr = 24, Mn = 25, Ni = 28)
• KMnO4 can be prepared from K2MnO4 as per the reaction: 3MnO4^2− + 2H2O → 2MnO4^− + MnO2 + 4OH^−. The reaction can go to completion by removing OH^− ions by adding:
• Which of the statements is not true?

⚔️ Practice NEET Chemistry free + battle 1v1 →