NEET Coordination Compounds — Set 11

Question 1

What is the oxidation state of nickel in $ \ce{[Ni(CN)4]^2-} $?

Accepted Answer

In $ \ce{[Ni(CN)4]^2-} $, each $ \ce{CN^-} $ is -1, totaling -4 for 4 ligands. The overall charge is -2. Thus, $ x + (-4) = -2 $, so $ x = +2 $.

Question 2

Which complex is colored due to a d-d transition?

Accepted Answer

$ \ce{[Mn(H2O)6]^2+} $ (Mn$^{2+}$, $ d^5 $) in an octahedral field undergoes d-d transitions, absorbing visible light (pale pink color).

Question 3

Which of the following complexes has a coordination number of 4?

Accepted Answer

$ \ce{[Ni(NH3)4]^2+} $ has 4 $ \ce{NH3} $ ligands, giving a coordination number of 4. Others like $ \ce{[Co(NH3)6]^3+} $ (6) and $ \ce{[Fe(CN)6]^4-} $ (6) have higher coordination numbers.

NEET Chemistry: Coordination Compounds — Practice Set 11

Q1. What is the oxidation state of nickel in \( \ce{[Ni(CN)4]^2-} \)?

Q2. Which complex is colored due to a d-d transition?

Q3. Which of the following complexes has a coordination number of 4?

Q4. What is the oxidation state of manganese in \( \ce{[Mn(CN)6]^4-} \)?

Q5. The hybridization of copper in \( \ce{[CuCl4]^2-} \) is:

Q6. Which complex has a secondary valence equal to twice its primary valence?

Q7. The magnetic moment of \( \ce{[Co(H2O)6]^2+} \) is approximately: (Co atomic number = 27)

Q8. What is the geometry of \( \ce{[Fe(CO)4]} \)?

Q9. What is the sum of the primary and secondary valences of cobalt in \( \ce{[Co(NH3)6]Cl3} \)?

Q10. Which complex has a coordination number of 4 and is diamagnetic?