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Given \( E^{0} K ^{+} / K =-2.93 K , \quad E^{0} Ag ^{+} / Ag =+0.80 V \) \( E^{0} Mg ^{2+} / Mg =-2.37 V , \quad E^{0} Cr ^{3+} / Cr =-0.74 V \) (a) Write cell representation of a cell made up of silver & magnesium Electrode. (b) What happens when aqueous NaCl is electrolysed using platinum electrodes. Write electrochemical reaction at anode and at cathode. |
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Answer» (a) \(E^\circ_{Ag^+/Ag}\) = +0.80 v (cathod) \(E^\circ_{Mg^+/Mg}\) = -2.37 v (Magnesium work as anode) cell representation \(Mg/Mg^{+2}_{aq}//Ag_{aq}^+/Ag\) (b) At anode Cl- \(\longrightarrow\) \(\frac12\)Cl2\( \uparrow\) + e- (oxidation) At cathode H+ + e- \(\longrightarrow\) \(\frac12\)H2\( \uparrow\) (reduction) on electrolysis of NaCl solution, NaOH will produced. |
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