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Acidified K(2)Cr(2)O(7) solution turns g...

Acidified `K_(2)Cr_(2)O_(7)` solution turns green when `Na_(2)SO_(3)` is added to it. This is due to the formation of

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`Cr_2O_7^(2-)+8H^(ɵ)+3SO_3^(2-)tounderset(green)(2Cr^(3+)+3SO_4^(2-)+4H_2O`
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