When a copper wire is placed in a solution of $AgNO_3$,the solution acquires a blue colour. This is due to the formation of

What is the value of $n$ in the Daniell cell? Why?

The electrode reaction that takes place at the anode of a $CH_4-O_2$ fuel cell is?

In batteries and fuel cells,which energy is converted into which energy?

The equilibrium constant for the reaction $Zn_{(s)} + Sn^{2+}_{(aq)} \rightleftharpoons Zn^{2+}_{(aq)} + Sn_{(s)}$ is $1 \times 10^{20}$ at $298 \ K$. The magnitude of standard electrode potential of $Sn/Sn^{2+}$ if $E_{Zn^{2+}/Zn}^0 = -0.76 \ V$ is $............ \times 10^{-2} \ V$. (Nearest integer)
Given : $\frac{2.303 \ RT}{F} = 0.059 \ V$

The cell reaction $Cu + 2Ag^{+} \to Cu^{+2} + 2Ag$ is best represented by