NEET Coordination Compounds — Set 2

Question 1

What is the geometry of the coordination sphere in $ \ce{[Ni(en)2]^2+} $?

Accepted Answer

$ \ce{[Ni(en)2]^2+} $ (Ni$^{2+}$, $ d^8 $) with 2 bidentate en (4 donor atoms) is square planar, using $ dsp^2 $ hybridization.

Question 2

Which complex has a metal ion that becomes diamagnetic when coordinated with 6 $ \ce{CN^-} $ ligands?

Accepted Answer

$ \ce{[Fe(H2O)6]^2+} $ (Fe$^{2+}$, $ d^6 $) is high spin with $ \ce{H2O} $ (4 unpaired electrons). With 6 $ \ce{CN^-} $ (strong field), it becomes $ \ce{[Fe(CN)6]^4-} $, low spin (0 unpaired electrons).

Question 3

What is the ratio of unidentate to bidentate ligands in $ \ce{[Co(NH3)3(en)Cl]^2+} $?

Accepted Answer

In $ \ce{[Co(NH3)3(en)Cl]^2+} $, unidentate ligands = 3 $ \ce{NH3} $ + 1 $ \ce{Cl^-} $ = 4; bidentate = 1 en. Ratio = 4 : 1.

NEET Chemistry: Coordination Compounds — Practice Set 2

Q1. What is the geometry of the coordination sphere in \( \ce{[Ni(en)2]^2+} \)?

Q2. Which complex has a metal ion that becomes diamagnetic when coordinated with 6 \( \ce{CN^-} \) ligands?

Q3. What is the ratio of unidentate to bidentate ligands in \( \ce{[Co(NH3)3(en)Cl]^2+} \)?

Q4. The EAN of Co in \( \ce{[Co(NH3)6]^3+} \) is: (Co atomic number = 27)

Q5. The magnetic moment of \( \ce{[MnCl4]^2-} \) is approximately: (Mn atomic number = 25)

Q6. Which of the following is a homoleptic complex?

Q7. Which complex has a metal ion with a \( d^7 \) configuration in an octahedral field that is high spin?

Q8. Which complex has a secondary valence of 4 according to Werner’s theory?

Q9. What is the geometry of \( \ce{[CoF4]^2-} \)?

Q10. The hybridization of cobalt in \( \ce{[CoF6]^3-} \) is: