JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Sample Paper Topic Test - Electrochemistry

  • question_answer
    Equivalent conductivity of \[BaC{{l}_{2}},{{H}_{2}}S{{O}_{4}}\] and HCl are \[{{y}_{1}},{{y}_{2}}\] and \[{{y}_{3}}S\,c{{m}^{-1}}e{{q}^{-1}}\] at infinite dilution. If conductivity of saturated \[BaS{{O}_{4}}\] solution is \[y\,S\,c{{m}^{-1}},\] then find \[{{K}_{sp}}\] of \[BaS{{O}_{4}}\].

    A) \[\frac{{{y}^{2}}}{{{({{y}_{1}}+{{y}_{2}}-{{y}_{3}})}^{2}}}\]

    B) \[\frac{2.5{{y}^{-2}}}{{{({{y}_{1}}+{{y}_{2}}-{{y}_{3}})}^{2}}}\]

    C) \[\frac{500}{{{y}_{1}}+{{y}_{2}}-{{y}_{3}}}\]          

    D) \[\frac{2.5\times {{10}^{5}}{{y}^{2}}}{{{({{y}_{1}}+{{y}_{2}}-{{y}_{3}})}^{2}}}\]

    Correct Answer: D

    Solution :

    [d] \[\Delta _{m}^{\infty }BaS{{O}_{4}}=2\Delta _{eq}^{\infty }(BaS{{O}_{4}})\]
    \[\Delta _{eq}^{\infty }(BaS{{O}_{4}})=\Delta _{eq}^{\infty }(B{{a}^{2+}})+\Delta _{eq}^{\infty }(SO_{4}^{-2})\]
    \[=\Delta _{eq}^{\infty }(BaC{{l}_{2}})+\Delta _{eq}^{\infty }({{H}_{2}}S{{O}_{4}})-\Delta _{eq}^{\infty }(HCl)\]
    \[\Delta _{eq}^{\infty }(BaS{{O}_{4}}){{y}_{1}}+{{y}_{2}}-{{y}_{3}}\]
    \[\Delta _{m}^{\infty }=2({{y}_{1}}+{{y}_{2}}-{{y}_{3}})\]
    For sparingly soluble salt,
    \[\Delta _{m}^{\infty }=\frac{k}{m}\times 100\]
    or         \[M=\frac{y}{2({{y}_{1}}+{{y}_{2}}-{{y}_{3}})}\times 1000\]
    \[=\frac{500}{{{y}_{1}}+{{y}_{2}}-{{y}_{3}}}\]
    \[{{K}_{sp}}={{M}^{2}}=\frac{2.5\times {{10}^{5}}{{y}^{2}}}{{{({{y}_{1}}+{{y}_{2}}-{{y}_{3}})}^{2}}}\]


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