Question

The reddish brown gas produced by heating $KCl$ with $K_2Cr_2O_7$ (solid) and conc. $H_2SO_4$ is

• A. $Cl_2$
• B. $CrO_{2}Cl_2$
• C. $CrO_3$
• D. $H_2CrO_4$

Answer 1

Answer: (B)

$CrO_{2}Cl_2$

Answer 2

When $KCl$ is heated with acidic $K_2Cr_2O_7$, reddish brown gas of chromyl chloride evaporated. $4KCl + K_2Cr_2O_7 + 3H_2SO_4 {->[\Delta]}$ \underset{\text{chromyl chloride}}{2CrO_2Cl_2} {^} + 2Na_2 SO_4 + K_2SO_4 + 3H_2O