The complex ion that will lose its crystal field stabilization energy upon oxidation of its metal to +3 state is: 

 

  • Option 1)

    \left [ Co\left ( phen \right ) _{3}\right ]^{2+}

     

  • Option 2)

    \left [ Zn\left ( phen \right ) _{3}\right ]^{2+}

  • Option 3)

    \left [ Fe\left ( phen \right ) _{3}\right ]^{2+}

     

  • Option 4)

    \left [ Ni\left ( phen \right ) _{3}\right ]^{2+}

Answers (2)

 

Coordination Entity -

Comparises of a central metal atom or ion bonded to a  fixed no of ions or molecules

- wherein

eg:

\left [ Co Cl_{3}\left ( NH_{3} \right )_{3} \right ] +\left [ Ni\left ( Co \right ) _{4}\right ]

    \downarrow                                      \downarrow

Coordination                      entity  

 

 

 

 

 

Stability of Complex -

Stability of complex is depends on nature of ligands, size of central atom and stability concept.

- wherein

Stability \alpha Stability Constant

 

 

 

Oxidation number of central metal atom -

The charge the central atom would carry if all the ligands are removed along with the electron pairs that are shared with the central atom.

-

 

 

 

 

 it is a strong field ligand.

(i) \left [ Co\left ( phen \right ) _{3}\right ]^{2+}\rightarrow\: \: \: \: \: \: \: \: \left [ Co\left ( phen \right ) _{3}\right ]^}

Co^{2+}=3d^{7}                         Co^{3+}=3d^{6}

CFSE=-1.8\bigtriangleup _{0}            CFSE=-2.4\bigtriangleup _{0}

In this case, CFSE value increase.

(ii) \left [ Zn\left ( phen \right )_{3} \right ]^{2+}\rightarrow \: \: \: \: \: \: \: \left [ Zn\left ( phen \right )_{3} \right ]^{2+}

Zn^{2+}=3d^{10}                          Zn^{3+}=3d^{9}

CFSE=0                          CFSE=-0.6\bigtriangleup _0

\therefore CFSE value increase.

(iii)  \left [ Fe\left ( phen \right )_{3}\right ]^{2+}\rightarrow \: \: \: \: \: \: \left [ Fe\left ( phen \right )_{3} \right ]^{3+}

           Fe^{2+}=3d^{6}                     Fe^{3+}=3d^{5}

       CFSE=-2.4\bigtriangleup _{0}            CFSE=-2.0\bigtriangleup _{0}

\therefore CFSE value decreases

(iv) \left [ Ni\left ( phen \right )_{3} \right ]^{2+}\rightarrow \: \: \: \: \: \: \: \: \: \: \left [ Ni\left ( phen \right ) _{3}\right ]^{3+}

           Ni^{2+}=3d^{8}                           Ni^{3+}=3d^{7}

CFSE=-1.2\bigtriangleup _{0}                       CFSE=-1.8\bigtriangleup _{0}

\therefore CFSE value increase.


Option 1)

\left [ Co\left ( phen \right ) _{3}\right ]^{2+}

 

Option 2)

\left [ Zn\left ( phen \right ) _{3}\right ]^{2+}

Option 3)

\left [ Fe\left ( phen \right ) _{3}\right ]^{2+}

 

Option 4)

\left [ Ni\left ( phen \right ) _{3}\right ]^{2+}

calculate cfse value on oxidation, ignore pairing energy, compare the magnitude
 

Most Viewed Questions

Preparation Products

JEE Main Rank Booster 2022

Booster and Kadha Video Lectures, Unlimited Full Mock Test, Adaptive Time Table, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 6999/-
Buy Now
Knockout JEE Main 2022 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 6999/-
Buy Now
Knockout JEE Main 2023 (One Month)

Personalized AI Tutor and Adaptive Time Table, Self Study Material, Live Classes, Unlimited Mock Tests and Personalized Analysis Reports, 24x7 Doubt Chat Support,.

₹ 13999/- ₹ 6999/-
Buy Now
Knockout JEE Main (One Month Subscription)

- AI Coach Study Modules, - Unlimited Mock Tests, - Expert Mentorship, - Study Improvement Plan.

₹ 2999/- ₹ 1999/-
Buy Now
Knockout JEE Main (Twelve Months Subscription)

- AI Coach Study Modules, - Unlimited Mock Tests, - Expert Mentorship, - Study Improvement Plan.

₹ 23999/- ₹ 14999/-
Buy Now
Boost your Preparation for JEE Main 2021 with Personlized Coaching
 
Exams
Articles
Questions