Which of the following reactions is possible at the anode?

  • A
    $F_2 + 2e^- \rightarrow 2F^-$
  • B
    $2H^+ + \frac{1}{2} O_2 + 2e^- \rightarrow H_2O$
  • C
    $Fe^{2+} \rightarrow Fe^{3+} + 1e^-$
  • D
    $Cu^{2+} + 2e^- \rightarrow Cu(s)$

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Identify the gas produced due to reduction of $NH_4^{+}$ ions at cathode during working of dry cell.

Observe the following statements about a dry cell:
$I$. It is a primary battery.
$II$. Zinc vessel acts as cathode.
$III$. $A$ paste of moist $NH_4Cl$,$MnO_2$ and $ZnCl_2$ is present between two electrodes.
$IV$. The potential of this cell is $1.5 \ V$.
The correct statements are:

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