Identify the case where there is change in oxidation number

1.	Identify the case where there is change in oxidation number
Answer» Acidified solution of`CrO_(4)^(2-)` `SO_(2)` gas BUBBLED through an acidic solution of `Cr_(2)O_(7)^(2-)` alkaline solution of `CrO_(4)^(2-)` AQUEOUS solution of `CrO_(2)CI_(2)` in NaOH Solution :(a) `2overset(+6)CrO_(4)^(2-)+2H^(+)rarroverset(+6)Cr_(2)O_(7)^(2-)+H_(2)O` (b)`overset(Cr_(2)O_(7)^(2-)+2H^(+)+3SO_(2)rarroverset(+3)Cr_(2)(SO_(4))^(3)+H_(2)O` (c ) `overset(+6)Cr_(2)O_(7)^(2-)+2OHA^(-)rarr2overset(+6)CrO_(4)^(2)+H_(2)O` (d) Ammoniacal solution of `CrO_(4)^(2-)` is `NH_(3)+H_(2)OrarrNH_(4)^(+)+OH^(-)` `overset(+6)CrO_(4)^(2-)+2 NH_(4)^(+)RARR(NH_(4))_(2)overset(+6)crO_(4)` `overset(+6)CrO_(2)CI_(2)+4NaOHrarrNa_(2)overset(+6)CrO_(4)+2NaCI+2H_(2)O` Thus only in rection(b) O.N of Crchangesform +6 to +3

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