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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Mock Test - Electrochemistry

  • question_answer
    The equivalent conductances of two strong electrolytes a infinite dilution in \[{{H}_{2}}O\] (where ions move freely througl a solution) at \[25{}^\circ C\]are given below \[{{\Lambda }^{o}}_{C{{H}_{3}}COONa}=91.0\,\,S\,\,c{{m}^{2}}\text{/}\,Eq\] \[{{\Lambda }^{o}}_{HCl}=426.2\,\,S\,\,c{{m}^{2}}\text{/}\,Eq\] What additional information/ quantity one needs to calculate \[\Lambda {}^\circ \]of an aqueous solution of aceti acid?

    A) \[\Lambda {}^\circ \]of \[NaCl\]

    B) \[\Lambda {}^\circ \]of\[C{{H}_{3}}\]COOK

    C) The limiting equivalent conductance of \[{{H}^{+}}(\lambda _{{{H}^{+}}}^{\circ })\]

    D) \[\Lambda {}^\circ \]of chloroaceti cacid (Cl\[C{{H}_{2}}\]COOH)

    Correct Answer: A

    Solution :

    [a] From Kohlraush?s law, \[{{\Lambda }^{o}}_{C{{H}_{3}}COOH}={{\Lambda }^{o}}_{C{{H}_{3}}COONa}+{{\Lambda }^{o}}_{HCl}-{{\Lambda }^{o}}_{NaCl}\]


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