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NEET Sample Paper NEET Sample Test Paper-69

  • question_answer
    A coordination complex compound of cobalt has the molecular formula 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 with excess of\[AgN{{O}_{3}}\], AgCl precipitates. The ionic formula for this complex would be

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

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

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

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

    Correct Answer: A

    Solution :

    The most probable complex which gives three moles ions in aqueous solution may be \[\left[ Co{{\left( N{{H}_{3}} \right)}_{5}}N{{O}_{2}} \right]C{{l}_{2}}\,\] because it gives two chlorine atoms on ionisation. \[[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]C{{l}_{2}}\,\to \,\,{{[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]}^{2+}}\,+2C{{l}^{-}}\]


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