AP EAMCET202017 Sep 2020Morning ShiftChemistryd and f Block ElementsActual
The correct statement about ( Cr ²⁺ ) and ( Mn ³⁺ ) among the following is (Given, atomic numbers of ( Cr =24 ) and ( Mn =25 ) )
Options
- A( Cr ²⁺ ) is a reducing agent
- B( Mn ³⁺ ) is a reducing agent
- CBoth ( Cr ²⁺ ) and ( Mn ³⁺ ) exhibit (d^5 ) outer electronic configuration
- DWhen ( Cr ²⁺ ) is used as reducing agent, it attains (d^5 ) configuration
Correct answer
C. Both ( Cr ²⁺ ) and ( Mn ³⁺ ) exhibit (d^5 ) outer electronic configuration
Step-by-step solution
( aligned Cr ²⁺ & [ Ar ] 3 d^4, E_ Cr ³⁺ / Cr ²⁺ ^ =-0.41 ~V Mn ³⁺ & [ Ar ] 3 d^3, E_ Mn ³⁺ / Mn ²⁺ ^0=+1.51 ~V aligned ) So, reducing power ( Cr ²⁺ > Mn ²⁺ )