Question

Which of the following statement(s) is (are) correct when a mixture of $NaCl$ and $K_{2}C{r}_2{O}_7$ is gently warmed with conc.$H_{2}S{O}_4$?

• A. A deep red vapor is evolved
• B. The vapors when passed into $NaOH$ solution give yellow solution of $N{a}_{2}Cr{O}_4$
• C. Chromyl chloride is also forms
• D. All of the above

Answer 1

The correct option is D All of the above

The Corresponding reactions are
$4NaCl+K_{2}C{r}_2{O}_7+6H_{2}S{O}_4\to \underset{\text{Red vapour}}{2Cr{O}_{2}C{l}_2}+4NaHS{O}_4+2KHS{O}_4+3H_{2}O$
$\underset{\text{Chromyl chloride}}{Cr{O}_{2}C{l}_2}+4NaOH\to \underset{\text{Yellow}}{N{a}_{2}Cr{O}_4}+2NaCl+2H_{2}O$