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100mL of 0.5 M `CuCO_4` (aq) solution was electrolysed using inert electrodes by passing current till the pH of the resulting solution was 2. The solution after electrolysis was Calculate the required volume (in mL) of `Na_2SO_2O_3`:A. `112.5ml`B. `100ml`C. `125ml`D. none of these |
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Answer» Correct Answer - A Initial `m`. Mole of `Cu^(2+)=5` `m`. Mole of `H^(+)` produced `=1` `m`. Mole of `Cu^(2+)` converted to `Cu=1/2=0.5` `m`. Mole of `Cu^(2+)` remaining in solution `=5-0.5=4.5` `2Cu^(2+)+4l^(-)toCu_(2)l_(2)+l_(2)` `l_(2)+2Na_(2)S_(2)O_(3)to2Nal+Na_(2)S_(4)O_(6)` `4.5=0.04xxV` `V=112.5` mol |
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