InterviewSolution
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InterviewSolution
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`H_(2)S` gas is passed into one `dm^(3)` of a solution containing 0.1 mole of `Zn^(2+)` and 0.01 mole of `Cu^(2+)` till the sulphide ion concentration reaches `8.1xx10^(-19)` moles. Which one of the following statements is true ? (`K_(sp)` of ZnS and CuS are `3xx10^(-22) and 8xx10^(-36)` respectively)A. Only ZnS precipitatesB. Both CuS and ZnS precipitateC. Only CuS precipitatesD. No precipitation occurs |
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Answer» Correct Answer - B Precipitation occurs if ionic product `gt K_(sp)` Ionic product of `ZnS=[Zn^(2+)][S^(2-)]` `=0.1xx8.1xx10^(-19)=8.1xx10^(-20) gt K_(sp)` Ionic product of CuS `=[cu^(2+)][S^(2-)]` `=0.01xx8.1xx10^(-19)=8.1xx10^(-21) gt K_(sp)` Hence, both will precipitate. |
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