Duration: 17:41

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Two litre solution of a buffer mixture containing \( 1.0 \mathrm{M}-\mathrm{NaH}_{2} \mathrm{PO}_{4} \) and \( 1.0 \mathrm{M}-\mathrm{Na}_{2} \mathrm{HPO}_{4} \) is placed in two compartments (one litre in each) of an electrolytic cell. The platinum electrodes are inserted in each compartment and 1.25 A current is passed for \( 965 \mathrm{~min} \). Assuming electrolysis of only water at each compartment, what will be \( \mathrm{pH} \) in each compartment after passage of above charge? ( \( \mathrm{p} K_{\mathrm{a}} \) for \( \mathrm{H}_{2} \mathrm{PO}_{4}{ }^{-}=2.15, \log 7=0.85 \) )
(a) Anode: 3.00
(b) Cathode: 3.00
(c) Anode: 1.30
(d) Cathode: 1.30
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