NEET Coordination Compounds — Set 16

Question 1

Which complex has a coordination number of 5 and follows the 18-electron rule?

Accepted Answer

$ \ce{[Fe(CO)5]} $ (Fe$^0$, $ d^8 $) has 5 $ \ce{CO} $ ligands. EAN = 26 + 2 × 5 = 36, but in organometallic context, 8 valence + 10 from ligands = 18 electrons.

Question 2

What is the EAN of Fe in $ \ce{[Fe(en)2(H2O)2]^2+} $? (Fe atomic number = 26)

Accepted Answer

Fe$^{2+}$ with 2 en (4 donor atoms) and 2 $ \ce{H2O} $ (2 donor atoms), total 6 ligands. EAN = 26 - 2 + 2 × 6 = 36.

Question 3

The EAN of Cr in $ \ce{[Cr(CO)6]} $ is: (Cr atomic number = 24)

Accepted Answer

Cr is in 0 oxidation state with 6 $ \ce{CO} $ ligands. EAN = 24 - 0 + 2 × 6 = 36.

NEET Chemistry: Coordination Compounds — Practice Set 16

Q1. Which complex has a coordination number of 5 and follows the 18-electron rule?

Q2. What is the EAN of Fe in \( \ce{[Fe(en)2(H2O)2]^2+} \)? (Fe atomic number = 26)

Q3. The EAN of Cr in \( \ce{[Cr(CO)6]} \) is: (Cr atomic number = 24)

Q4. What is the coordination number of chromium in \( \ce{[Cr(NH3)2(en)2]^3+} \)?

Q5. The hybridization of nickel in \( \ce{[Ni(NH3)4]^2+} \) is:

Q6. The IUPAC name of \( \ce{[Co(NH3)4(SCN)Cl]Cl} \) is:

Q7. Which complex has a metal ion with zero unpaired electrons in an octahedral field?

Q8. What is the hybridization of Cr in \( \ce{[Cr(NH3)6]^3+} \)?

Q9. What is the geometry of \( \ce{[Co(en)2Cl2]^+} \) in its trans form?

Q10. Which of the following is an example of ionization isomerism?