1.

The number of `S^(2-)` ions present in `1 L` of `0.1 (M) H_(2)S` solution having `[H^(+)]=0.1 (M)` is ( Given `H_(2)ShArr2H^(+)+S^(2-) K_(a)=1.1xx10^(-21)`)A. `6.625xx10^(3)`B. `6.625xx10^(4)`C. `6.625xx10^(5)`D. `6.625xx10^(6)`

Answer» Correct Answer - A
`H_(2)S underset(larr)(rarr) 2H^(+)+S^(2-)`
`K_(a)=1.1xx10^(-21)=([H^(+)]^(2)[S^(2-)])/([H_(2)S])=(10^(-2)xx[S^(2-)])/(0.1)`
or `[S^(2-)]=1.1xx10^(-20)(m)`
` :. ` no. of `S^(2-) ions =1.1xx10^(-20)xx6.0^(23)xx10^(23)`
`=1.1xx6.023xx10^(3)=6.625xx10^(3)`


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