NEET Coordination Compounds — Set 7

Question 1

How many electrons are in the $ e_g $ orbitals of $ \ce{[Fe(H2O)6]^3+} $ with Fe in the +3 state? (Fe atomic number = 26)

Accepted Answer

Fe$^{3+}$ ($ d^5 $) in $ \ce{[Fe(H2O)6]^3+} $ (octahedral) with weak field $ \ce{H2O} $ is high spin: $ t_{2g}^3 e_g^2 $, so 2 electrons in $ e_g $.

Question 2

Which complex follows Werner’s coordination theory by having a primary valence of 3?

Accepted Answer

Primary valence is the oxidation state. In $ \ce{[Co(NH3)6]Cl3} $, Co is +3 (balancing 3 $ \ce{Cl^-} $), satisfying Werner’s theory with ionizable counter ions.

Question 3

How many ionizable ions are produced when $ \ce{[Co(NH3)5Br]SO4} $ is dissolved in water?

Accepted Answer

In $ \ce{[Co(NH3)5Br]SO4} $, the complex $ \ce{[Co(NH3)5Br]^+} $ and $ \ce{SO4^2-} $ dissociate into 2 ions. The $ \ce{Br^-} $ inside is a ligand, not ionizable.

NEET Chemistry: Coordination Compounds — Practice Set 7

Q1. How many electrons are in the \( e_g \) orbitals of \( \ce{[Fe(H2O)6]^3+} \) with Fe in the +3 state? (Fe atomic number = 26)

Q2. Which complex follows Werner’s coordination theory by having a primary valence of 3?

Q3. How many ionizable ions are produced when \( \ce{[Co(NH3)5Br]SO4} \) is dissolved in water?

Q4. Which complex aligns with Werner’s theory by having a primary valence of 2?

Q5. What is the oxidation state of iron in \( \ce{[Fe(H2O)5NO]^2+} \)?

Q6. Which complex produces 3 ions in aqueous solution, including the coordination sphere?

Q7. Which ligand causes the smallest crystal field splitting in an octahedral field?

Q8. Which complex has a secondary valence of 6 according to Werner’s theory?

Q9. In which complex does the metal ion have an oxidation state twice the number of bidentate ligands?

Q10. Which pair represents coordination isomerism?