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DUMET Medical DUMET Medical Solved Paper-2004

  • question_answer
    A coordination complex compound of cobalt has the molecular formulae containing five ammonia molecules, one nitro group and two chlorine atoms for one cobalt atom. One mole of this compound produces three mole ions in an aqueous solution on reacting this solution with excess of \[AgN{{O}_{3}},\,AgCl\] precipitate. The ionic formula for this complex would be :

    A)  \[[Co{{(N{{H}_{3}})}_{5}}(N{{O}_{2}})]C{{l}_{2}}\]

    B)  \[[Co{{(N{{H}_{3}})}_{5}}Cl][Cl(N{{O}_{2}})]\]

    C)  \[[Co{{(N{{H}_{3}})}_{4}}(N{{O}_{2}})Cl][(N{{H}_{3}})Cl]\]

    D)  \[[Co{{(N{{H}_{3}})}_{5}}][{{(N{{O}_{2}})}_{2}}C{{l}_{2}}]\]

    Correct Answer: A

    Solution :

    \[\because \] The complex gives three ions in aqueous solution \[\therefore \] The complex should be\[[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]C{{l}_{2}}\] It will give 3 ions on dissociation as follows: \[[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]C{{l}_{2}}\to CO{{(N{{H}_{3}})}_{5}}N{{O}_{3}}+2C{{l}^{-}}\]The chloride ions will give ppt. with\[AgN{{O}_{3}}\].


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