Exams › JEE Main › Chemistry

Identify the coordination complexes in which the central metal ion has d4 configuration. (A) [FeO4]2- (B) [Mn(CN)6]3- (C) [Fe(CN)6]3- (D) Cr2O - C - Me4 (H2O)2 (E) [NiF6]2- Choose the correct answer from the options given below :

1. (C) and (E) only
2. (B), (C) and (D) only
3. (A), (B) and (E) only
4. (A), (B) and (E) only

Correct answer: (A), (B) and (E) only

Solution

The correct options include coordination complexes where the central metal ion has a d4 electron configuration, which occurs in certain oxidation states of transition metals. In this case, [Fe(CN)6]3- has iron in the +3 oxidation state, resulting in a d4 configuration, while the other complexes listed also contain metals that can exhibit a d4 state.

Related JEE Main Chemistry questions

• When sodium hydroxide is introduced into an aqueous Zn2+ solution, a white precipitate forms, and this precipitate dissolves when more NaOH is added. In such a solution, zinc is present in the:
• When excess ammonia is added to a copper sulphate solution, a deep blue colour appears because of the formation of which species?
• In the nitroprusside ion, iron and NO are present as Fe$^{2+}$ and NO$^+$ instead of Fe$^{3+}$ and NO. These two formulations can be distinguished by
• In the brown ring test for nitrite and nitrate ions, the characteristic brown ring is produced because a complex ion is formed with which formula?
• What is the spin-only magnetic moment, expressed in Bohr magnetons (μB), for Ni²⁺ in aqueous solution? (Atomic number of Ni = 28)
• Silver chloride dissolves in aqueous ammonium hydroxide because it leads to the formation of which species?

⚔️ Practice JEE Main Chemistry free + battle 1v1 →