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Haryana PMT Haryana PMT Solved Paper-2011

  • question_answer
    One mole of the complex compound \[Co{{(N{{H}_{3}})}_{5}}C{{l}_{2}}\] gives 3 moles of ions on dissolution in water. One mole of the same complex reacts with two moles of \[AgN{{O}_{3}}\] solution to yield two moles of \[AgCl(s)\]. The structure of the complex is

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

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

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

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

    Correct Answer: D

    Solution :

                    Formation of two moles of \[AgCl\] shows that \[2C{{l}^{-}}\] ions are ionisable. \[[Co{{(N{{H}_{3}})}_{5}}Cl]C{{l}_{2}}\underset{3\,ions}{\mathop{{{[Co{{(N{{H}_{3}})}_{5}}Cl]}^{2+}}}}\,+2C{{l}^{-}}\]\[2C{{l}^{-}}+2AgN{{O}_{3}}\xrightarrow{{}}2AgCl+2NO_{3}^{-}\]


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