# Chemistry Class 12 NCERT Solutions: Chapter 9 Coordination Compounds Part 11

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Q: 29. Amongst the following ions which one has the highest magnetic moment value?

(i)

(ii)

(iii)

Answer:

(i) No. of unpaired electrons in

Then,

(ii) No. of unpaired electrons in

Then,

(iii) No. of unpaired electrons in

Hence,

has the highest magnetic moment value.

Q: 30. The oxidation number of cobalt in is

(i)

(ii)

(iii)

(iv)

Answer:

We know that is a neutral ligand and K carries a charge of . Therefore, the complex can be written as . Therefore, the oxidation number of in the given complex is . Hence, option (iii) is correct.

Q: 31. Amongst the following, the most stable complex is

(i)

(ii)

(iii)

(iv)

Answer:

We know that the stability of a complex increases by chelation. Therefore, the MoS stable complex is

Q: 32. What will be the correct order for the wavelengths of absorption in the visible region for the following:

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 values of the ligands increases in the spectrochemical series is as follows:

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: