1.

(x)/(20)M concentration of H^(+) ion must be maintained in a saturate H_(2)S(0.1M) to precipitates CdS but not ZnZ, if [Cd^(2+)]=[Zn^(2+)]=0.1M initially. K_(sp)(CdS)=8xx10^(-27), K_(sp)(ZnS)=1xx10^(-21)K_(a)(H_(2)S)=1xx10^(-21)ZnS will not precipitate atconcentration of H^(+) greater than (x)/(20)M. The value of x is .

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ANSWER :`2.00`


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