The yellow colour solution of Na_2CrO_4 chang | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(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 $:-$

Similar Questions

State the uses of zinc and iron.

$Cu_2Cl_2$ with $HCl$ in the presence of oxidizing agents gives:

Among $CrO$,$Cr_2O_3$,and $CrO_3$,the sum of spin-only magnetic moment values of basic and amphoteric oxides is . . . . . . . . $10^{-2} \ BM$ (nearest integer).
(Given atomic number of $Cr$ is $24$)

Identify the factor responsible for the colour of transition metal compounds.

Excess of $KI$ reacts with $CuSO_4$ solution and then $Na_2S_2O_3$ solution is added to it. Which of the statements is incorrect for this reaction?

Vedclass Test Series

Exam Paper Generator

Online Exam Module