Page No 260: - Chapter 9 - Coordination Compunds - Exercise Solutions - Ncert Solutions class 12 - Chemistry

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Question 9.31:

Amongst the following, the most stable complex is

(i) [Fe(H₂O)₆]³⁺

(ii) [Fe(NH₃)₆]³⁺

(iii) [Fe(C₂O₄)₃]³⁻

(iv) [FeCl₆]³⁻

Answer:

We know that the stability of a complex increases by chelation. Therefore, the most stable complex is [Fe(C₂O₄)₃]³⁻.

Question 9.32:

What will be the correct order for the wavelengths of absorption in the visible region for the following:

[Ni(NO₂)₆]⁴⁻, [Ni(NH₃)₆]²⁺, [Ni(H₂O)₆]²⁺

Answer:

The central metal ion in all the three complexes is the same. Therefore, absorption in the visible region depends on the ligands. The order in which the CFSE values of the ligands increases in the spectrochemical series is as follows:

H₂O < NH₃ < NO₂⁻

Thus, the amount of crystal-field splitting observed will be in the following order:

Hence, the wavelengths of absorption in the visible region will be in the order:

[Ni(H₂O)₆]²⁺ > [Ni(NH₃)₆]²⁺ > [Ni(NO₂)₆]⁴⁻