The colour of CrO_4^{2-}(aq.) is not changed | vedclass

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(B) The equilibrium between chromate and dichromate ions is given by: $2CrO_4^{2-}(aq.) + 2H^+(aq.) \rightleftharpoons Cr_2O_7^{2-}(aq.) + H_2O(l)$.In

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$NH_3$ solution

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(B) The equilibrium between chromate and dichromate ions is given by: $2CrO_4^{2-}(aq.) + 2H^+(aq.) \rightleftharpoons Cr_2O_7^{2-}(aq.) + H_2O(l)$.In acidic medium $(pH $HCl$,$CH_3COOH$,and $NO_2$ (which forms $HNO_3/HNO_2$ in water) provide an acidic medium.$NH_3$ solution is basic $(pH > 7)$,so it does not shift the equilibrium towards the formation of $Cr_2O_7^{2-}$,thus the yellow colour remains unchanged.

The colour of $CrO_4^{2-}(aq.)$ is not changed by:

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