During the perparation of `H_(2)S_(2)O_(s)` (per disulphuric acid) `O_(2)` gas is also released at anode as byproduct. When `9.72 L` of `H_(2)` releaseds at cathode and `2.35 L O_(2)` at anode the weight `H_(2)S_(2)O_(8)` depostited at the cathode is .A. ` 87. 12`B. ` 48. 65`C. ` 83. 42`D. ` 51. 74`

During the perparation of `H_(2)S_(2)O_(s)` (per disulphuric acid) `O_

1.	During the perparation of `H_(2)S_(2)O_(s)` (per disulphuric acid) `O_(2)` gas is also released at anode as byproduct. When `9.72 L` of `H_(2)` releaseds at cathode and `2.35 L O_(2)` at anode the weight `H_(2)S_(2)O_(8)` depostited at the cathode is .A. ` 87. 12`B. ` 48. 65`C. ` 83. 42`D. ` 51. 74`
Answer» Correct Answer - B ` 2HSO_4^(-) rarr H_2S_2O_8 +2e` ` 20^(2-) rarr O_2 +4e` `(2.35)/(22.5) =0. 105 0.42 mole` `H^+ + 2e rarr H_2` Mole of e for ` H_2 S_2O_8 =0. 87 - 0. 42 =0. 45 ` mole ` :.` Mole of ` H_2 S_2 OO_8 =0. 225 "mole" = 43. 65 g`.

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