1.

A 0.2 g sample containing copper (II) was analysed iodometrically, where copper (II) is reduced to copper (I) by iodide ions. 2Cu^(2+) +4I^(-)rarr2 CuI+I_(2) If 20 mL of 0.1 M Na_(2)S_(2)O_(3) solution is required for titrationof the liberated iodine, then the percentage of copper in the sample will be :

Answer»

`31.75%`
`63.5%`
`53%`
`37%`

ANSWER :B


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