1. Tardigrade
  2. Question
  3. Chemistry
  4. Which of the following will act as cathode when connected to standard hydrogen electrode which has E° value given as zero? (i) Zn2+/Zn, E° = - 0.76 V (ii) Cu2+/Cu, E° = + 0.34 V (iii) Al3+/Al, E° = -1.66 V (iv) Hg2+/Hg, E° = + 0.885 V

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Q. Which of the following will act as cathode when connected to standard hydrogen electrode which has $E^{\circ}$ value given as zero?
$\left(i\right) Zn^{2+}/Zn$, $E^{\circ } = - 0.76 \,V$
$\left(ii\right) Cu^{2+}/Cu$, $E^{\circ } = + 0.34 \,V$
$\left(iii\right) Al^{3+}/Al$, $E^{\circ } = -1.66 \,V$
$\left(iv\right) Hg^{2+}/Hg$, $E^{\circ } = + 0.885\, V$

Redox Reactions

Solution:

When the value of standard reduction potential is positive, the electrode undergoes reduction and acts as cathode.