NEET Sample Paper NEET Sample Test Paper-51

  • question_answer The oxidation potentials of Zn, Cu, Ag, \[{{H}_{2}}\] and Ni are 0.76, -0.34, -0.80, 0 and 0.25 volt respectively. Which of the following reactions will provide maximum voltage?

    A) \[Zn+C{{u}^{2+}}\,\to \,\,Cu+Z{{n}^{\text{2+}}}\]

    B) \[~Zn+2A{{g}^{+}}\to \text{ }2Ag+Z{{n}^{2+}}\]

    C) \[{{H}_{2}}+C{{u}^{2+}}\to \,\,2{{H}^{+}}+Cu\]

    D) \[{{H}_{2}}+N{{i}^{2+}}\to 2{{H}^{+}}+Ni\]

    Correct Answer: B

    Solution :

    \[When\text{ }E{{{}^\circ }_{cathode}}-E{{{}^\circ }_{anode}}\,is\,\,maximum\]

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