Class 12 Chemistry - Chapter The d-and f-Block Elements NCERT Solutions | Compare the stability of +2 oxidation st

Welcome to the NCERT Solutions for Class 12th Chemistry - Chapter The d-and f-Block Elements. This page offers a step-by-step solution to the specific question from Exercise 2, Question 19: compare the stability of 2 oxidation state for th....
Question 19

Compare the stability of +2 oxidation state for the elements of the first transition series.

Answer
Sc     +3        
Ti +1 +2 +3 +4      
V +1 +2 +3 +4 +5    
Cr +1 +2 +3 +4 +5 +6  
Mn +1 +2 +3 +4 +5 +6 +7
Fe +1 +2 +3 +4 +5 +6  
Co +1 +2 +3 +4 +5    
Ni +1 +2 +3 +4      
Cu +1 +2 +3        
Zn   +2          

From the above table, it is evident that the maximum number of oxidation states is shown by Mn, varying from +2 to +7. The number of oxidation states increases on moving from Sc to Mn. On moving from Mn to Zn, the number of oxidation states decreases due to a decrease in the number of available unpaired electrons. The relative stability of the +2 oxidation state increases on moving from top to bottom. This is because on moving from top to bottom, it becomes more and more difficult to remove the third electron from the d-orbital.

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