NEET Coordination Compounds — Set 20

Question 1

The central metal ion in $ \ce{[Fe(CN)4]^2-} $ uses which hybrid orbitals?

Accepted Answer

$ \ce{[Fe(CN)4]^2-} $ (Fe$^{2+}$, $ d^6 $) with 4 ligands is square planar (strong field $ \ce{CN^-} $), using $ dsp^2 $ hybridization.

Question 2

What is the IUPAC name of $ \ce{[Co(NH3)4(H2O)Cl]Cl2} $?

Accepted Answer

Ligands are named alphabetically: ammine ($ \ce{NH3} $), aqua ($ \ce{H2O} $), chlorido ($ \ce{Cl} $). There are 4 $ \ce{NH3} $, 1 $ \ce{H2O} $, and 1 $ \ce{Cl} $ in the complex. Co’s oxidation state is +3 (since $ \ce{[Co(NH3)4(H2O)Cl]^2+} $ balances 2 $ \ce{Cl^-} $). Name: tetraammineaquachloridocobalt(III) chloride.

Question 3

Which complex shows optical isomerism?

Accepted Answer

Optical isomerism occurs in chiral complexes. $ \ce{[Co(en)3]^3+} $ (octahedral, with 3 bidentate en ligands) lacks a plane of symmetry, forming non-superimposable mirror images (d and l).

NEET Chemistry: Coordination Compounds — Practice Set 20

Q1. The central metal ion in \( \ce{[Fe(CN)4]^2-} \) uses which hybrid orbitals?

Q2. What is the IUPAC name of \( \ce{[Co(NH3)4(H2O)Cl]Cl2} \)?

Q3. Which complex shows optical isomerism?

Q4. Which complex has a \( d^5 \) metal ion with the maximum possible unpaired electrons in a tetrahedral field?

Q5. Which complex has a magnetic moment closest to that of a free \( d^5 \) ion?

Q6. What is the charge of the coordination sphere in \( \ce{[Fe(NH3)4Cl2]NO3} \)?

Q7. What is the coordination number of nickel in \( \ce{[Ni(en)2(H2O)2]^2+} \)?

Q8. Which complex can show optical isomerism?

Q9. Which ligand causes the weakest crystal field splitting in a tetrahedral complex?

Q10. How many geometrical isomers are possible for \( \ce{[Co(NH3)2(H2O)2Cl2]^+} \) excluding optical isomers?