Electrochemistr...

The number of coulombs required to reduce $$12.3\ g$$ of nitrobenxene to aniline is :

Alizarin belongs to the class of

The standard electrode potential for the following reaction is $$+1.33V$$. What is the potential at $$pH=2.0$$? 
$${Cr}_{2}{O}_{7}^{2-}(aq. $$M$$)+14{H}^{+}(aq)+6{e}^{-}\rightarrow 2{Cr}^{3+} (aq, $$1M$$)+7{H}_{2}O(l)$$

Arrange the following metals in the order of their decreasing reactivity?
$$Fe, Cu, Mg, Ca, Zn, Ag$$

On the basis of the information available from the  reaction$$\dfrac { 4 }{ 3 } { Al }+O_{ 2 }\rightarrow\dfrac { 2 }{ 3 } { Al }_{ 2 }{ O }_{ 3 },$$$$\triangle G=-827KJ{ mol }^{ -1 }of{ O }_{ 2 }$$ The minimum e.m.f. required to carry out an electrolysis of$$\left( F=96500C{ mol }^{ -1 } \right)$$

In the galvanic cell, $$Ca|{ Ca }^{ 2+ }(1M)\parallel { Ag }^{ + }(1M)|Ag$$, the electrons will travel in the external circuit:

Given below are the half-cell reactions:
$${Mn}^{2+}+2{e}^{-}\rightarrow Mn;{E}^{o}=-1.18V$$
$$2({Mn}^{+3}+{e}^{-}\rightarrow {Mn}^{2+});{E}^{o}=+1.51V$$
The $${E}^{o}$$ for $$3{Mn}^{2+}\rightarrow Mn+2{Mn}^{3+}$$ will be:

In the cell, $$Zn|Zn^{2+}||Cu^{2+}|Cu,$$ the negative electrode is 

Given: $$E_{I_{2}/I^{-}}^{0} (1M) = +0.54V$$   and   $$E_{Br_{2}/Br^{-}}^{0} (1M) = +1.09 V$$

How many coulombs of electricity are required for the oxidation of  $$1$$ mole of  $$\mathrm { H } _ { 2 } \mathrm { O }$$  to  $$\mathrm { O } _ { 2 }$$ ?