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  4. Which of the following statement(s) is/are correct when a mixture of NaCl and K2Cr2O7 is gently warmed with conc. H2SO4 ?

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Q. Which of the following statement(s) is/are correct when a mixture of $NaCl$ and K$_2Cr_2O_7$ is gently warmed with conc. $H_2SO_4 ? $

IIT JEEIIT JEE 1998The d-and f-Block Elements

Solution:

$4NaCl+K_2Cr_2O_7 +6H_2SO_4 \rightarrow \, \underset{\text{Chromyl chloride(red vapour)}}{2CrO_2Cl_2}+4NaHSO_4 + 2KHSO_4 + 3H_2O$
$CrO_2Cl_2+4NaOH \rightarrow \underset{\text{Yellow solution}}{Na_2CrO_4}+2NaCl+2H_2O$