Q24 of 53 Page 234

Calculate the number of unpaired electrons in the following gaseous ions: Mn3+, Cr3+, V3+, and Ti3+. Which one of these is the most stable in aqueous solution?

From the table given below:



















Mn3+ : 3d4



unpaired electrons = 4



V3+ : 3d2



unpaired electrons =2



Cr3+ : 3d3



unpaired electrons= 3



Ti3+ : 3d1



unpaired electrons =1



Cr3+ is most stable in aqueous solution because of half filled d-orbital.


More from this chapter

All 53 →
22

What is meant by ‘disproportionation’? Give two examples of disproportionation reaction in aqueous solution.

 23

Which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?

 25

Give examples and suggest reasons for the following features of the transition metal chemistry:

(i) The lowest oxide transition metal is basic, the highest is amphoteric/acidic.


(ii) A transition metal exhibits highest oxidation state in oxides and fluorides.


(iii) The highest oxidation state is exhibited in oxoanions of a metal.

 26

Indicate the steps in the preparation of:

(i) K2Cr2O7 from chromite ore. (ii) KMnO4 from pyrolusite ore.