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NEET Chemistry Coordination Chemistry Question Bank Self Evaluation Test - Co-ordination Compounds

  • question_answer
    Consider   the   following   complex\[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}C{{O}_{3}} \right]Cl{{O}_{4}}\] The coordination number, oxidation number, number of d-electrons and number of unpaired d-electrons on the metal are respectively 

    A) 6,3,6,0                         

    B) 7,2,7,1

    C) 7,1,6,4                         

    D) 6,2,7,3

    Correct Answer: A

    Solution :

    [a] \[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}C{{O}_{3}} \right]Cl{{O}_{4}}\]. Six monodentate ligands are attached to Co hence C. N. of Co=6; \[O.N.=x+5\times \left( 0 \right)+1\times \left( -2 \right)+1\times \left( -1 \right)=0\,\therefore \] \[x=+3;\] electronic configuration of \[C{{o}^{3+}}[Ar]3{{d}^{6}}4{{s}^{0}}\] hence number of d electrons is 6. All d electrons are paired due to strong ligand hence unpaired electron is zero.


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