The d-And-f-Block Elements

The d-And-f-Block Elements

Question

The Orange colour of Cr2O72– ion changes to yellow when treated with an
alkali. Why ?

Answer

The Orange colour of Cr2O72– ion changes to yellow when treated with an
alkali because of the formation of chromate ion CrO42- ion, which is yellow in colour.
stack Cr subscript 2 straight O subscript 7 superscript 2 minus end superscript space with Orange below plus straight H subscript 2 straight O space rightwards harpoon over leftwards harpoon space stack Cr subscript 2 straight O subscript 4 superscript 2 minus end superscript with Yellow below space plus space 2 straight H to the power of plus

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