Ncert Exercises & Solutions

When orange solution containing $C r_{2} 0_{7}^{2 -}$ ion is treated with an alkali, a yellow solution is formed and when $H^{+}$ ions are added to yellow solution, an orange solution is obtained. Explain why does this happen?

NEETprep Answer: When orange solution containing

C r_{2} O_{7}^{2 -}

ion is treated with an alkali, a yellow solution of

C r_{2} O_{7}^{2 -}

is obtained. On the same way

C r_{2} {O_{7}}^{2 -} \to_{H^{+}}^{O H^{-}} C r {O_{4}}^{2 -}

D i s c h r o m a t e C h r o m a t e

(o r a n g e) (y e l l o w)

when

H^{+}

ions are added to yellow solution, an orange solution is obtained due to interconversion.

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