The yellow colour solution of Na_2CrO_4 chang | vedclass

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(C) The aqueous solution of sodium chromate $(Na_2CrO_4)$ is yellow due to the presence of the chromate ion $(CrO_4^{2-})$.When $CO_2$ gas is passed t

Vedclass · Accepted Answer

$Na_2Cr_2O_7$

Vedclass · Answer

(C) The aqueous solution of sodium chromate $(Na_2CrO_4)$ is yellow due to the presence of the chromate ion $(CrO_4^{2-})$.When $CO_2$ gas is passed through this solution,it reacts with water to form carbonic acid $(H_2CO_3)$,which increases the acidity of the solution.In an acidic medium,the chromate ions $(CrO_4^{2-})$ are converted into dichromate ions $(Cr_2O_7^{2-})$,which are orange-red in color.The chemical reaction is as follows:$2Na_2CrO_4 + 2CO_2 + H_2O \rightarrow Na_2Cr_2O_7 + 2NaHCO_3$Thus,the formation of sodium dichromate $(Na_2Cr_2O_7)$ is responsible for the color change.

The yellow colour solution of $Na_2CrO_4$ changes to orange-red on passing $CO_2$ gas due to the formation of $:-$

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