AP EAMCET2009Chemistryd and f Block Elements
Which one of the following sets correctly represents the increase in the paramagnetic property of the ions?
Options
- ACu ²⁺> V ²⁺> Cr ²⁺> Mn ²⁺
- BCu ²⁺ < Cr ²⁺ < V ²⁺ < Mn ²⁺
- CCu ²⁺ < V ²⁺ < Cr ²⁺ < Mn ²⁺
- DV ²⁺ < Cu ²⁺ < Cr ²⁺ < Mn ²⁺
Correct answer
C. Cu ²⁺ < V ²⁺ < Cr ²⁺ < Mn ²⁺
Step-by-step solution
Paramagnetic property depends upon the number of unpaired electrons. Higher the number of unpaired electrons, higher the paramagnetic property will be. Cu ²⁺=[ Ar ] 3 d^9 , no. of unpaired electrons =1 V ²⁺=[ Ar ] 3 d^3 , no. of unpaired electrons =3 Cr ²⁺=[ Ar ] 3 d^4 , no. of unpaired electrons =4 Mn ²⁺=[ Ar ] 3 d^5 , no. of unpaired electrons =5 Hence, correct order is Cu ²⁺ < V ²⁺ < Cr ²⁺ < Mn ²⁺