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 .

Answer»

` 87. 12`
` 48. 65`
` 83. 42`
` 51. 74`

SOLUTION :` 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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