Q50 / 200 · Manipal (MET) 2013 · Chemistry

The spontaneous reaction that takes place in this cell is

  • A
    $\mathrm{Zn}+\mathrm{Ni} \longrightarrow \mathrm{Zn}^{2+}+\mathrm{Ni}^{2+}$
  • Correct answer
    B
    $\mathrm{Zn}+\mathrm{Ni}^{2+} \longrightarrow \mathrm{Zn}^{2+}+\mathrm{Ni}$
  • C
    $\mathrm{Ni}+\mathrm{Zn}^{2+} \longrightarrow \mathrm{Ni}^{2+}+\mathrm{Zn}$
  • D
    $\mathrm{Ni}^{2+}+2 \mathrm{~K} \longrightarrow 2 \mathrm{~K}^{+}+\mathrm{Ni}$

Solution

Zn is at lower potential, it will be oxidised and the cell reaction will be $\mathrm{Zn}(s)+\mathrm{Ni}^{2+}(a q) \longrightarrow \mathrm{Zn}^{2+}(a q)+\mathrm{Ni}(s)$

Hence, the correct answer is option: 'B'.

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