NEET Coordination Compounds — Set 14

Question 1

Which pair represents ionization isomerism?

Accepted Answer

$ \ce{[Cr(NH3)5Cl]SO4} $ and $ \ce{[Cr(NH3)5SO4]Cl} $ differ by exchanging $ \ce{Cl^-} $ and $ \ce{SO4^2-} $ between the coordination sphere and counter ion.

Question 2

Which complex has the highest crystal field splitting energy ($ \Delta_o $) with $ \ce{Co^{3+}} $ as the central ion?

Accepted Answer

$ \Delta_o $ depends on ligand strength (spectrochemical series: $ \ce{CN^-} > \ce{NH3} > \ce{H2O} > \ce{F^-} $). $ \ce{[Co(CN)6]^3-} $ with strong field $ \ce{CN^-} $ has the highest $ \Delta_o $.

Question 3

Which ligand can form a chelate ring with a metal ion?

Accepted Answer

Chelating ligands are polydentate. Oxalate ($ \ce{C2O4^2-} $) is bidentate, forming a 5-membered ring, unlike unidentate ligands like $ \ce{F^-} $ or $ \ce{NH3} $.

NEET Chemistry: Coordination Compounds — Practice Set 14

Q1. Which pair represents ionization isomerism?

Q2. Which complex has the highest crystal field splitting energy (\( \Delta_o \)) with \( \ce{Co^{3+}} \) as the central ion?

Q3. Which ligand can form a chelate ring with a metal ion?

Q4. The number of geometrical isomers for \( \ce{[Co(NH3)3Cl2(H2O)]^+} \) is:

Q5. What type of isomerism exists between \( \ce{[Co(NH3)5(NO2)]Cl2} \) and \( \ce{[Co(NH3)5(ONO)]Cl2} \)?

Q6. What is the primary valence of Ni in \( \ce{[Ni(en)2Cl2]} \)?

Q7. Which complex changes its geometry from tetrahedral to square planar when \( \ce{Cl^-} \) ligands are replaced by \( \ce{CN^-} \)?

Q8. How many moles of \( \ce{AgCl} \) precipitate when 1 mole of \( \ce{[Ni(NH3)4Cl2]Cl2} \) reacts with excess \( \ce{AgNO3} \)?

Q9. Which complex is optically active?

Q10. Which \( d^8 \) metal ion in a tetrahedral field with weak field ligands is paramagnetic?