Questions in electrochemistry

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Metal can be prevented from rushing by
The technique of protecting a metal from corrosion by connecting it to a second metal (that is more easily oxidised) is called
A current 2.0 A is passed for 5 hours through a molten metal salt deposits 22 g of metal (At. wt. = 177). The oxidation state of the metal in the metal salt is
A cell constructed by coupling a standard copper electrode and a standard magnesium electrode has emf of 2.7 volts. If the standard reduction potential of copper electrode is + 0.34 volt that of magnesium electrode is
On the basis of the information available from the reaction $\frac{4}{3}Al+{{O}_{2}}\to \frac{2}{3}A{{l}_{2}}{{O}_{3}},\,\Delta G=-827\,kJ\,mo{{l}^{-1}}$ of ${{O}_{2}}$. The minimum emf required to carry out an electrolysis of $A{{l}_{2}}{{O}_{3}}$ is $(F=96500\,\,C\,mo{{l}^{-1}})$
(i) Copper metal dissolves in 1 M silver nitrate solution and crystals of silver metal get deposited (ii) Silver metal does not react with 1 M zinc nitrate solution (iii) Zinc metal dissolves in 1 M copper sulphate solution and copper metal gets deposited Hence the order of decreasing strength of the three metals as reducing agents will be
A Galvanic cell is set up from a zinc bar weighing 50g and 1.0litre, 1.0M, $CuS{{O}_{4}}$ solution. How long would the cell run, assuming it delivers a steady current of 1.0 ampere
The standard potential at ${{25}^{o}}C$ for the following half reactions are given against them $Z{{n}^{2+}}+2{{e}^{-}}\to Zn,\,{{E}^{0}}=-0.762V$ $M{{g}^{2+}}+2{{e}^{-}}\to Mg,\,{{E}^{0}}=-2.37V$ When zinc dust is added to the solution of $MgC{{l}_{2}}$
$C{{u}^{+}}$ ion is not stable in aqueous solution because of disproportionation reaction. ${{E}^{0}}$ value for disproportionation of $C{{u}^{+}}$ is (Given $E_{C{{u}^{2+}}/C{{u}^{+}}}^{0}=0.15,\,E_{C{{u}^{2+}}/Cu}^{0}=0.34V)$
The temperature coefficient of cell whose operation is based on the reaction $Pb\,(s)+HgC{{l}_{2}}(aq)\to PbC{{l}_{2}}(aq)+Hg(l)$ is ${{\left( \frac{\partial E}{\partial T} \right)}_{p}}=1.5\times {{10}^{-4}}V\,{{K}^{-1}}$ The amount of heat released during the operation is

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