In which of the following there is a change in oxidation number ? (a) – InterviewSolution

InterviewSolution

1.	In which of the following there is a change in oxidation number ? (a) An aqueous solution of `CrO_(4)^(2-)` is acidified. (b) `SO_(2)` gas is passed through acidified `Cr_(2)O_(7)^(2-)` solution. (c) `Cr_(2)O_(7)^(2-)` solution is made alkaline. (d)` CrO_(2)Cl_(2)` is dissolved in NaOH.
Answer» (a) `overset(+6)(2[CrO_(4)]^(2-))+2H^(+) to overset(+6)([Cr_(2)O_(7)]^(2-))+H_(2)O` : no change in O.N (b) `overset(+6)([Cr_(2)O_(7)]^(2-))+overset(+4)(3SO_(2))+2H^(+) to overset(+3)(2[Cr]^(3+))+overset(+6)(3[SO_(4)]^(2-))+H_(2)O` :Change in O.N (c) `overset(+6)([Cr_(2)O_(7)]^(2-))+2OH^(-) tooverset(+6)(2[CrO_(4)]^(2-))+H_(2)O` :No Change in O.N. (d) `overset(+6)(CrO_(2))Cl_(2)+2NaOH to Na_(2) overset(+6)(CrO_(4))` :No change in O.N

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