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  4. The reddish brown gas produced by heating KCl with K2Cr2O7 (solid) and conc. H2SO4 is

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

AMUAMU 2012The d-and f-Block Elements

Solution:

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 \xrightarrow{\Delta} $
$\underset{\text{chromyl chloride}}{2CrO_2Cl_2} \uparrow + 2Na_2 SO_4 + K_2SO_4 + 3H_2O$