NEET Coordination Compounds — Set 15

Question 1

Which complex exhibits a color due to a d-d transition involving $ e_g $ orbitals?

Accepted Answer

$ \ce{[Ni(H2O)6]^2+} $ (Ni$^{2+}$, $ d^8 $) in an octahedral field has $ t_{2g}^6 e_g^2 $, and the d-d transition from $ t_{2g} $ to $ e_g $ absorbs visible light (green color).

Question 2

Which of the following complexes has a fac-isomer?

Accepted Answer

$ \ce{[Cr(H2O)3Cl3]} $ (octahedral, $ \ce{[Ma3b3]} $) can have a facial (fac) isomer where 3 $ \ce{Cl^-} $ ligands occupy one face.

Question 3

What is the primary valence of Ni in $ \ce{[Ni(NH3)6]Cl2} $?

Accepted Answer

Primary valence is the oxidation state. In $ \ce{[Ni(NH3)6]Cl2} $, $ \ce{NH3} $ is neutral, and 2 $ \ce{Cl^-} $ balance $ \ce{[Ni(NH3)6]^2+} $, so Ni is +2.

NEET Chemistry: Coordination Compounds — Practice Set 15

Q1. Which complex exhibits a color due to a d-d transition involving \( e_g \) orbitals?

Q2. Which of the following complexes has a fac-isomer?

Q3. What is the primary valence of Ni in \( \ce{[Ni(NH3)6]Cl2} \)?

Q4. Which ligand produces the strongest crystal field splitting in an octahedral complex?

Q5. The hybridization of Fe in \( \ce{[Fe(CN)6]^4-} \) is:

Q6. The hybridization of cobalt in \( \ce{[CoF6]^3-} \) is:

Q7. Which ligand pair in \( \ce{[Cr(H2O)4(CN)(SCN)]^+} \) could exhibit linkage isomerism if one were ambidentate?

Q8. What is the shape of \( \ce{[PtCl4]^2-} \)?

Q9. What is the oxidation state of platinum in \( \ce{[PtCl6]^2-} \)?

Q10. How many unpaired electrons are present in \( \ce{[Co(H2O)6]^3+} \)? (Co atomic number = 27)