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JEE Main & Advanced Chemistry Electrochemistry / विद्युत् रसायन Question Bank Cell constant and Electrochemical cells

  • question_answer
    The chemical reaction, \[2AgCl(s)+{{H}_{2}}(g)\ \to \] \[2HCl(aq)+2Ag(s)\] taking place in a galvanic cell is represented by the notation                                                 [AIIMS 2005]

    A)                 \[Pt|{{H}_{2}}(g),1\text{bar }\!\!|\!\!\text{ 1}M\ KCl(aq)|AgCl(s)|Ag(s)\]

    B)                 \[Pt(s)|{{H}_{2}}(g),\ 1\text{bar }\!\!|\!\!\text{ }\ 1M\ HCl(aq)||1M\ A{{g}^{+}}(aq)|Ag(s)\]

    C)                 \[Pt(s)|{{H}_{2}}(g),\ 1\text{bar }\!\!|\!\!\text{ }\ 1M\ HCl(aq)|AgCl(s)|Ag(s)\]

    D)                 \[Pt(s)|{{H}_{2}}(g),\ 1\text{bar }\!\!|\!\!\text{ }\ 1M\ HCl(aq)|Ag(s)|AgCl(s)\]

    Correct Answer: B

    Solution :

               2AgCl(s) + H2(g) ® 2HCl(aq.) + 2Ag(s)                    The activities of solids and liquids are takes as unity and at low concentrations, the activity of a solute is approximated to its molarity.                    Th cell reaction will be                                 Pt(s) | H2(g), 1 bar | H+(aq) 1 M | AgCl(aq) 1 M | Ag(s)


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