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Home  >>  JEEMAIN and AIPMT  >>  Chemistry  >>  Redox Reactions
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$AgNO_3(aq)\;\overset{\overset{electrolysis}{\Large\rightarrow}}{in\;presence\;of\;pt\;electrode}$ then at end of electrolysis

$\begin{array}{1 1}(a)\;P^H\uparrow\\(b)\;P^H\downarrow\\(c)\;P^H\;constant\\(d)\;None\end{array}$

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Electrolysis of $AgNO_3$(aq)
$AgNO_3(aq)\rightarrow Ag^+(aq)+NO_3^-+H_2O$
$O$-anode and cathode
At cathode
$Ag^++e^-\rightarrow Ag\quad E_1^o$
$H_2O+e^-\rightarrow \large\frac{1}{2}$$H_2+OH^-\quad E_2^o$
$E_1^o > E_2^o$
At anode
$NO_3^-\overset\rightarrow\ {Oxidation}$
$H_2O\rightarrow \large\frac{1}{2}$$O_2+2H^++2e$
So $2Ag^++H_2O\rightarrow 2Ag+2H^++\large\frac{1}{2}$$O_2$
Since concentration of $H^+$ increases .So $P^H\downarrow$
Hence (b) is the correct answer.
answered Dec 12, 2013 by sreemathi.v

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