When a mixture of NaCl,K_{2}Cr_{2}O_{7} and c | vedclass

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

Question

(C) $X$ is $CrO_{2}Cl_{2}$ and $Y$ is $Na_{2}CrO_{4}$.When a mixture of $NaCl$,$K_{2}Cr_{2}O_{7}$ and conc. $H_{2}SO_{4}$ is heated in a dry test tube

Vedclass · Accepted Answer

$CrO_{2}Cl_{2}$ and $Na_{2}CrO_{4}$

Vedclass · Answer

(C) $X$ is $CrO_{2}Cl_{2}$ and $Y$ is $Na_{2}CrO_{4}$.When a mixture of $NaCl$,$K_{2}Cr_{2}O_{7}$ and conc. $H_{2}SO_{4}$ is heated in a dry test tube,a red vapour $(X)$,$CrO_{2}Cl_{2}$ (chromyl chloride),is evolved.This vapour $CrO_{2}Cl_{2}$ reacts with an aqueous solution of $NaOH$ to form $Na_{2}CrO_{4}$ (sodium chromate),which is yellow in color.The chemical reactions are as follows:$4Cl^{-} + Cr_{2}O_{7}^{2-} + 6H^{+} \longrightarrow 2CrO_{2}Cl_{2} (X) + 3H_{2}O$$CrO_{2}Cl_{2} + 4OH^{-} \longrightarrow CrO_{4}^{2-} + 2Cl^{-} + 2H_{2}O$The resulting $CrO_{4}^{2-}$ ions in the presence of $Na^{+}$ ions form $Na_{2}CrO_{4} (Y)$.

When a mixture of $NaCl$,$K_{2}Cr_{2}O_{7}$ and conc. $H_{2}SO_{4}$ is heated in a dry test tube,a red vapour $(X)$ is evolved. This vapour $(X)$ turns an aqueous solution of $NaOH$ yellow due to the formation of $Y$. $X$ and $Y$,respectively,are

Similar Questions

$NaCl$ reacts with conc. $H_2SO_4$ and $K_2Cr_2O_7$ to give reddish fumes $(B)$,which react with $NaOH$ to give yellow solution $(C)$. $(B)$ and $(C)$ respectively are:

Which from the following alloys is used in gas turbine engines?

Write two uses of $KMnO_4$ and $K_2Cr_2O_7$.

In ruby and emerald,the metal ion$(s)$ present is/are

Write about the utility of $d$- and $f$-block elements and their compounds. Or describe the following uses of $d$- and $f$-block elements and their compounds: $(i)$ In iron/steel $(ii)$ As pigments $(iii)$ In batteries $(iv)$ In coinage $(v)$ As catalysts.

Vedclass Test Series

Exam Paper Generator

Online Exam Module