The yellow colour solution of Na_2CrO_4 chang | vedclass

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(C) When $CO_2$ gas is passed through an aqueous solution of sodium chromate $(Na_2CrO_4)$,it reacts with water to form carbonic acid $(H_2CO_3)$.This

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$Na_2Cr_2O_7$

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(C) When $CO_2$ gas is passed through an aqueous solution of sodium chromate $(Na_2CrO_4)$,it reacts with water to form carbonic acid $(H_2CO_3)$.This acid provides $H^+$ ions,which shift the equilibrium of the chromate-dichromate system.The reaction is: $2Na_2CrO_4 + 2CO_2 + H_2O \rightarrow Na_2Cr_2O_7 + 2NaHCO_3$.The formation of sodium dichromate $(Na_2Cr_2O_7)$ is responsible for the change in color from yellow to orange-red.

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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