A mixture of NaCl and K_{2}Cr_{2}O_{7} is hea | vedclass

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(A) The reaction is the Chromyl Chloride test: $4Cl^{-} + Cr_{2}O_{7}^{2-} + 6H^{+} \rightarrow 2CrO_{2}Cl_{2} + 3H_{2}O$. The deep red vapours consis

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The vapours contain $CrO_{2}Cl_{2}$ and $Cl_{2}$

Vedclass · Answer

(A) The reaction is the Chromyl Chloride test: $4Cl^{-} + Cr_{2}O_{7}^{2-} + 6H^{+} \rightarrow 2CrO_{2}Cl_{2} + 3H_{2}O$. The deep red vapours consist of $CrO_{2}Cl_{2}$ (Chromyl chloride). Statement $A$ is false because the vapours do not contain $Cl_{2}$ gas. When these vapours are passed into $NaOH$,a yellow solution of sodium chromate is formed: $CrO_{2}Cl_{2} + 4OH^{-} \rightarrow CrO_{4}^{2-} + 2Cl^{-} + 2H_{2}O$. This solution,when treated with lead acetate,gives a yellow precipitate of lead chromate: $CrO_{4}^{2-} + Pb^{2+} \rightarrow PbCrO_{4} \downarrow$ (yellow).

$A$ mixture of $NaCl$ and $K_{2}Cr_{2}O_{7}$ is heated with conc. $H_{2}SO_{4}$,deep red vapours are formed. Which of the following statements is false?

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