What is a positive and a negative electrode?

  • A
    Positive electrode is the anode,negative electrode is the cathode.
  • B
    Positive electrode is the cathode,negative electrode is the anode.
  • C
    Positive electrode is the electrolyte,negative electrode is the ion.
  • D
    Positive electrode is the salt bridge,negative electrode is the wire.

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The standard free energy change $(\Delta G^{\circ})$ for the following reaction (in $kJ$) at $25^{\circ} C$ is $3 Ca_{(s)} + 2 Au^{3+}(aq, 1 M) \rightarrow 3 Ca^{2+}(aq, 1 M) + 2 Au_{(s)}$ (given: $E^{\circ}_{Au^{3+}/Au} = +1.50 \ V, E^{\circ}_{Ca^{2+}/Ca} = -2.87 \ V, 1 \ F = 96500 \ C \ mol^{-1}$)

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In a galvanic cell,the salt bridge is used to:

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