InterviewSolution
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InterviewSolution
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`K_(a1)`,`K_(a2)`and `K_(a3)` are the respective ionisation constants for the following reactions. `H_(2)ShArrH^(+)+HS^(-)`,`HS^(-)hArrH^(+)S^(-2)` `H_(2)ShArr2H^(+)+S^(2-)` The correct relationship between `K_(a1)`,`K_(a2)`and `K_(a3)` isA. `K_(a_(3))=K_(a_(1))xxK_(a_(2))`B. `K_(a_(3))=K_(a_(1))+K_(a_(2))`C. `K_(a_(3))=K_(a_(1))-K_(a_(2))`D. `K_(a_(3))=K_(a_(1))//K_(a_(2))` |
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Answer» Correct Answer - A For the reaction : `H_(2)ShArrH^(+)+HS^(-),K_(a_(1))` `K_(a_(1))=([H^(+)][HS^(-)])/([H_(2)S])` . . . (i) For the reaction : `HS^(-)hArrH^(+)+S^(2-),K_(a_(2))` `K_(a_(2))=([H^(+)][S^(2-)])/([HS^(-)])` . . .(ii) For the reaction : `H_(2)ShArr2H^(+)+S^(2-),K_(a_(3))` `K_(a_(3))=([H^(+)]^(2)[S^(2-)])/([H_(2)S])` . . . (iii) By multiplying eqn. (i) and eqn. (ii), we get `K_(a_(1))xxK_(a_(2))=([H^(+)][Hs^(-)])/([H_(2)S])xx([H^(+)][S^(2-)])/([HS^(-)])` `=([H^(+)]^(2)[S^(2-)])/([H_(2)S])=K_(a_(3))` |
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