Reference Electrodes

A standard hydrogen electrode has zero electrode potential because

Standard hydrogen electrode (SHE) is a

The electrode potential of $\mathrm{S}.\mathrm{H}.\mathrm{E}$ is fixed as 

The standard hydrogen electrode has zero electrode potential because

During the course of reaction, a half cell is connected with SHE, pH of SHE is increased. The connected half cell behaves as:

What would be ${\mathrm{E}}_{\mathrm{red}}^{\mathrm{o}}$ of hydrogen electrode having $\mathrm{pH}=3$? 

What could be the best material for electrode $\mathrm{M}$, if a student set up the following apparatus to determine the hydrogen ion concentration of solution X.
                                 The cell is $\text{M}\left|{\text{H}}_{2\left(\text{g}\right)}|2{\text{H}}_{\left(\text{aq}\right)}^{+}\right|\left|{\text{Cu}}_{\left(\text{aq}\right)}^{2+}\right|{\text{Cu}}_{\left(\text{s}\right)}$ . 

Consider the cell

$\mathrm{Pt}\left|{\mathrm{H}}_2\left(1\mathrm{ }\mathrm{atm}\right)\right|\mathrm{ }\mathrm{HCl}\mathrm{ }\left({10}^{-6}\mathrm{M}\right)\left|\mathrm{AgCl}\right|\mathrm{Ag}\left|\mathrm{Pt}\right.$

Given: ${\mathrm{E}}_{\mathrm{cell}}=0.92\mathrm{Volt}$

Calculate the ${\mathrm{E}}^{\mathrm{o}}$ for ${\mathrm{Cl}}^{-}/\mathrm{AgCl}/\mathrm{Ag}$

$Pt, H_2,$ $\left|\begin{array}{c}{H}^{+}\\ (pH=3)\end{array}\right|\left|\begin{array}{c}{H}^{+}\\ (pH=5)\end{array}\right|$ $H_2, Pt,$ E.M.F. of cell will be

In which of the following electrochemical cell overall cell reaction is :

$\mathrm{HgO}\left(\mathrm{s}\right)+{\mathrm{H}}_2\left(\mathrm{g}\right)\to \mathrm{Hg}\left(\mathrm{l}\right)+{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)$

Consider the cell: $\mathrm{Ag}\left|\mathrm{AgCl}\left(\mathrm{s}\right)\right|\mathrm{KCl}\mathrm{ }\left(1\mathrm{M}\right)\left|{\mathrm{Hg}}_2{\mathrm{Cl}}_2\left(\mathrm{s}\right)\right|\mathrm{Hg}\mathrm{ }\left(\mathrm{l}\right)\left|\mathrm{Pt}\right.$. The cell potential:

A standard hydrogen electrode has zero electrode potential because:

Which one of the following does not hold good for S.H.E (Standard Hydrogen Electrode) ?

 The reduction potential of hydrogen half-cell will be negative if